Yep, thats also true lol.

Quoting myself from another comment in this thread:

... of course you can then go way, way too far into fullblown sim territory and end up with actual geriatrics and/or turboautists, lol.

(I say this lovingly as a turboautist who has spent probably an unhealthy amount of time in various niche sim communities, lol)

Well, you got Arma 3 or Arma Reforger...

Those are pretty much the most commonly played milsims, with tons of available mods and dlc, huge expansive maps, players have their own inventories, can customize your whole load out and such...

SQUAD is sort of a milsim lite, maybe? It evolved out of Project Reality for Battlefield 2, they eventually made their whole own game in Unreal.

It retains the round based, class base core concept, but greatly expands on the more arcady nature of the Battlefield series with many more realistic gameplay concepts, much of them revolving around playing a role in a squad.

The maps aren't as big as Arma, but you can still end up with a whole game session taking an hour or two.

There are also other games that basically aim for what SQUAD does, but not in a modern combat setting, Hell Let Loose for WW2 as an example.

I think Gray Zone Warfare is trying to be a new sort of milsim on the block, but so far I've heard roughly mixed reviews of it... and there are tons of 'tactical shooters'... but they tend to be smaller in scope and usually lack vehicles, or don't include near as many, or simulate them as extensively... and a whole lot of them tend to be developed by basically people who vastly overestimate their ability to make a game, and can be very toxic / in denial about this... so be careful with those, haha, probably check youtube for some reviews before diving in.

There's also Gunner Heat PC if you want a very tank oriented tank sim, and DCS if you want an excruciatingly detailed, combat oriented flight sim, and you also hate money, lol.

Oh right, for basically most of these, you're probably going to want to try and find and join some kind of larger community on discord or something like that... usually they'll have guides, tutorials, plan matches/games on a schedule, maybe even offer some kind of psuedo boot camp / training for enthusiastic noobs, hehe.