The not wanting to paint goes back years before contrast paints and slapchop. Even GW switching 10 points of scoring in a game of 40k to be for having painted your shit as "battle ready" caused outrage. Before that it was people whining that tournaments wanted 3 colors and basing done. You might think it was the meta chasers who swap armies regularly via ebay who complained, no it was the casuals. The meta chasing tournament players would just dunk their ebay purchases in paint stripper, 3 colors, a wash, and some sand on the base and be done with it without giving a shit how it looked.
The time constraints also may seem like it comes from the tournament players(if every game takes 6 hours, you'd never be able to hold a tournament). But the reality is people got older and got busy with shit(work, life, kids) and don't want to spend 8 hours to play a game which is reasonable. The trouble here is that people took that to already faster skirmish games, and wanted to bring it down to 3 hours, then 90 minutes(which is still ok depending on the game), and eventually some people complained an hour was too long because they were out of the house, having to use their phone when it wasn't their turn(since they weren't at home in the basement playing video games or moderating reddit), etc.
Then games needed to start having co-op modes to avoid people feeling bad when they just spent $150 on a starter box, maybe painted it, and then got their ass kicked at the store after maybe skimming through part of the rulebook for 20 minutes. It avoided them feeling bad. Can't feel bad about losing a game if everyone loses, or someone else can carry you to victory.
Now you've got RPGs over the past couple of years, and it's spilling into other games as well(board games have been doing this for quite a while) with single player game modes. An argument could be made that such a thing would allow a person to have an understanding of the rules and concepts of the game in action instead of showing up to play with zero experience and slowing things down for everyone else needing to constantly look up rules. But no, this is for the social outcasts who have already been booted from every friend group at the game store, people who refuse to even attempt to socialize enough to play a game with other people, and those who believe everyone at the game store is an evil chud nazi bigot who will immediately call them out for being a trans gay something or other and report them to the local anti LGBTQ+2AISHDTVETC hit squad to kidnap them for re-education/deportation/execution.
