I cant imagine anything being different, how would you do everything the same?

Your imagination has failed. There are a million ways to do this shit, and part of anarchism is allowing many ways of life to thrive.

I'll also be reminding you that we currently have literally every problem you're proposing, often funded or exacerbated by tax dollars and capital's infernal machinery. Literally the worst case you're afraid of isn't worse than how most people already live.

conquest

You've seen how industrialized centralized militaries do against scrappy insurgencies where every person is a potential fighter. Its not good for them. They lose. They limp home bleeding. The wounds kill the beast as often as not. When the means of production proliferate and are impossible to control, so do the means of resistance. Nothing short of scorched earth extermination would give them the advantage, and I'm not even sure of that.

Though the almost-anarchist AANES has several organized military groups that fought off the much larger better armed turkish-isis coalition, the anarchist-influenced zapatistas fought off the much larger Mexican federal military, and even Mao largely adopted our methods to make his authoritarian warlordism work for shit.

laws

Nope. You know when shit isn't okay? When nobody would appreciate some shit? Yeah you do. Don't fucking do that shit, or somebody, anybody, might do something about it. Unless you explain yourself. No more violent than a group of dedicated killers and kidnappers roaming the street, probably less, and certainly more egalitarian.

It might even stop some of the awful shit victimization and exploitation that laws enforce and do nothing to stop.

My answer to 'who will stop murders if not police?' is always 'worst case? Same as now; friends and bystanders. But bystanders will be empowered to act and my tax dollars won't have paid for the bullet and a weeks paid vacation for the murderer'

people suck and need to be good

People including myself have been raised and brutalized when we fail to participate in societies that run on engines of vice. Its been drilled into us. You still asked this. I was still here to answer you. A decentralized system of social cohesion is more adaptable and less corruptable, because there are no single points of failure and it doesn't valorize exploitation and corruption.

Without the hyperobject of authoritarian violence escalating everything, it gets a lot easier to talk to people about shit.

When we aren't all alienated from how others support us and our ways of life, it gets much easier to compromise with them, because the compromise is shit like 'okay, let's make more slightly less excessive graphics cards' or 'let's all be a little hungry, so nobody fucking starves to death, because I throw up and waste like a thousand calories every time I see a corpse' rather than 'exterminate half the Jews and half the queers and half the (oh my god thanks was a centrist)'.

inequality

Takes a lot to maintain. The maintenance of injustice obeys almost the rules of thermodynamics. Without a belief than injustice is necessary or even acceptable, without a follower herd mentality where we can only make change with the permission of a daddy, it's much harder to do and does not scale. Of course it will never be completely even-the best fish will always be at the coasts, just as it is now, and the farmer or expert gardener will always taste the best vegetables, but a conscious effort to keep everyone happy and fed is in everyone's best interest, and who doesn't want to share what they love? Which leads to

why would anyone do anything

If I want to put together a gaming computer, that requires infrastructure. That requires miners and electrical engineers and mechanical engineers and all sorts of technicians and tons of resources. That's not really a problem; I know for a fact there are people in all of those professions who want to call me slurs and remind me that my mom gets way more laid than me (like I never lived in the same house with the woman) while they tea bag my virtual corpse. And they want others to shout slurs at over the internet too!

It's usually infrastructure that takes the real work. Infrastructure works for everybody, and if nobody owns it, everybody can use it, be responsible for it, maintain and improve it, make it work for them. Look at how open source software works.

And its a lot less tempting to exploit others when you'll have to defend that shit yourself, and everyone will hate you for it. Maybe kill you or embargo you for it. So everything ends up being for everybody. Or close enough.

fairness

You've never seen this shit. Every time you've ever been told you're allowed or disallowed, it wasn't based on ecological carrying capacity or long term feasability, but on totally artificial structures of privilege.

It feels a lot different to be told 'I'm sorry, there's no food left. I can't help' or 'this is incurable. All the research is hitting a brick wall' than 'sorry, you can't afford to live, fucking peasant.'. Right now if I steal food, less food gets thrown away and the line doesn't go up so much. During a famine in a rational society, if I steal food someone else goes hungry-or there was enough food I didn't have to steal it. It's not the same.

In the future; consider reading a fucking book.