I don't block them all via user settings (yet), but I've blocked every bot ive encountered so far.
I don't like or trust bot-generated summaries and prefer to read articles as the authors intended. It's also annoying to go into a post looking for a discussion and the only comment is from a bot.
Other bots are just obnoxious like the community link and piped link bots.
Then the repost bots that post stuff from the alien site just get a blanket ban.
I prefer for Lemmy to be a place for discovery and discussion, and I think it's better without all the noise and dead end posts from bots.
All that said, It's probably a risky position to rely on people not blocking bots. I also find it very impersonal and unworthy of engagement when a bot account asks how my day is going.