The first past the post system kinda focuses in on radical ends of things. It makes moderate positions not make sense to campaign or even vote for.

so... at the end of 84 months you have something of value. Or at the end of the lease you have.. zero.. value. Leases make very, very litle sense for the end consumer of things. And.. like.. used cars are a thing.

I think... you should answer the question. Something tells me you don't want to reveal what you actually think.

needs more upvotes

You're missing the whole latent heat thing that comes with phase change. Most of what you're describing is akin to the air pack you find on an airliner. They do the air conditioning with just squeezing gasses and heat exchangers. They are practical on airliners ONLY because they have a ready supply of compressed air, and when you're burning megawatts of fuel, a few hundred kilowatts of compressor losses are "in the noise". The magic of heat pumps is in the phase change. The critical thing that nets you the near magic heat pumping ability with heat pumps, is the boiling and condensing of the gas and liquid. Also note, you can't practically compress liquids, so your explanation falls apart when suggesting you compress a liquid.

So you're on your ebike, going 15mph. Using 140w or so. You're spending 15-20w on the drivetrain, and the remainder is entirely aerodynamic drag. You're putting 120-125w into making wind move. You're also losing 5-10 watts to the drive electronics and dashboard. So your total power use is 150w.

If you're going to recharge a battery. In the same time it takes to ride, you need to get at least 150w of power into another battery. Sadly, batteries don't actually "just cleanly charge" there are some losses, but since we're going to take an hour to charge it, lets call it 5%. So to fill up that battery we need 157watts of input power.

Your bike, moving at a steady speed, is absorbing 150w of power. If we want another 155w of power, where is that going to come from? If we take it from.. say.. the front wheel, we are now absorbing another 155w of power. So to maintain the same speed, we now need to push the bike along with 305w of power. And.. now we need a bike that makes 305w of power, to go the same speed we were going with 150w. .... And we're only generating 155w.

There is no free lunch. If you're doing work, you need to get that power from somewhere.

In specific, 12ga, with some sort of buckshot. You don't wanna hurt someone because you gave them shells with slugs in them and they have a gun with a tight choke in it. At least, if you're going to stock it for "currency"