I was a NEET for a few years after the 2008 recession. I got fired at the worst possible time. I know getting a job is extremely hard these days, but it was even worse in the late 2000s and early 2010s. I was also really depressed and demotivated at the time so not trying as hard as I possibly could have.
The problem with being NEET is you generally have to live with family. That means you live under their house, and you must follow their rules, and they're sure as hell going to remind you of this all the time. It also means they're going to hound you about your NEET status pretty regularly as no parents want their son to just stay home all day everyday. I know there's some people who live on their own as NEETs on disability, but that means having to live in section 8 housing and only having money for the most basic necessities, and you wouldn't even have enough money to drive a car even if you got one for free due to car insurance, maintenance and gas.
There's a part of me that's nostalgic about my time as a NEET. 4chan was still decent, the internet was still fun, I still enjoyed playing video games, I didn't have any health problems. I also miss not having to go to a job I hated, deal with neurotic managers, and constantly worry about if I'm going to get fired or get my hours cut. But I don't miss the uncertainty of that time. Not knowing if my parents would kick me out. Dealing with their rules and getting shouted at, often for no reason, like my dad was mad that my mom shouted at him and he'd just take it out on me (and/or one of my brothers). Don't get me wrong, I miss my parents now that they've passed away, but I don't miss living with them. I also don't miss being completely broke.
I'd love to be a NEET in a hypothetical scenario where most labor is automated and we all get UBI. That's my dream actually. Frankly I hate my job and I hated every job I ever had.