If certain people lack the motivation or willpower to set up a custom 1v1 game against an AI on a ladder map, we should not be designing FAF ladder architecture to cater to those people. No offense. I'm 100% in favor of letting everybody coexist and use the FAF platform even if they have different playstyles/motivation than me. But I think it's crazy to change the ladder in order to accommodate those people. Ladder should always be about playing against other people. You can approach it casually, you can tryhard it, you can sandbox a dozen build orders or just drop in and see what happens. But it should always be about human vs. human and nothing else.
What even is the endpoint of designing an AI that's good enough to replace a human ladder player? We want to cutting off one form of human-human interaction and replace it with a human-AI interaction? That would not be an achievement.
I don't hate the idea of creating some AI "players" who play against humans in order to gauge the AI's trueskill rating but that could be done without changing the 1v1 ladder. You could set up a completely separate ladder where people often get matched to AIs and different AIs compete with humans and with each other for rating points to see which is the best AI. But leave the real ladder alone.
Look at how butthurt people were over the TMM rating reset. Putting AIs into the real ladder could cause problems 100x worse than that. There's so little upside compared to the amount of damage that could happen.