(and probably more privately, they believe I am too outspoken..)
Pro’s/Con’s; just like with all public broadcast information.
Also, its always embarrassing when someone talks about a linkedin comment I have made, not because I am ashamed but because I am sort of used to a semi-anonymous shouting into the void style forum like hackernews.
I _do_ have acquaintances I made outside of working life on LinkedIn, though - the only two that are really active are a mechanical engineer who mostly just posts about robotics and someone in marketing. I don't know if it's because I'm just really good friends with the latter person, but I've never felt annoyed reading their posts; they mostly seem to just talk about enjoying conferences or new externally facing projects - ad campaigns, large-scale promotions, etc - wherever they are currently working. I don't know if part of that is they're in the EU and the culture for marketers there is different?
Overall, I don't see anyone I know being a cringe bootlicker on LinkedIn. These people are very visible, but probably a small minority of users.