At first it didn't bother me as I thought bot posting may incentivate people to comment but since this rarely happens and now I think they are just polluting the communities.
I know I can filter them but I wonder what is the general sentiment about this.
Disagree with your first point. If the account itself is labelled as a bot then that's good enough. I'm mostly on Jerboa and it adds an icon next to bot accounts' usernames.
The distinction you are missing is indicating the post is from a bot rather than indicating the account is a bot. The difference in that distinction is that many Lemmy readers will not indicate anywhere on a post that it is from a bot simply because the account is labeled as a bot.