Some people like the idea but to me that only makes sense if you are basically doing the nomad thing at a cheap location. You'd want to stay in the place for awhile as you're still spending most of the "vacation" working all day. On your days off you could do more. On an actual vacation you would actually be enjoying yourself the whole time. Traveling to just spend all your time working seems like a waste.
Also just try to work on just a laptop for a week. It sucks. I'm not doing that.
5.56, typical rounds for ARs, aren't high caliber. In many states it's illegal to hunt deer with that caliber because it's under powered. Who told you it's high powered?
People absolutely use "high capacity" mags when these laws say more than 10 is too high. Take something like a Glock handgun typical capacity there is 15 to 17. For a modern rifle capacities of 20 to 40 is extremely common. For ARs the standard capacity is 30. Certainly any rifle anyone would consider for self defense is going to have mags larger than 10.
Overpenetration is a concern for any round a person would use for self defense. That includes 9mm and buckshot. Using 5.56 or 300 blk isn't actually that much more dangerous when just about anything is going through a bunch of wall if someone misses. And 5.56 might actually stop sooner than a slower moving handgun round because ballistics do weird things.