I suspect that long COVID risk is lower in vaccinated individuals (and hope so as an expat who traveled halfway around the world to get vaccinated) but the risk should be quantified.

There are a growing number of reports of people with breakthrough infections who are experiencing symptoms that aren't "mild", and some reports of people with "long COVID" like symptoms. It's not reason enough to panic, but it's concerning, especially in light of the fact that until very recently, health experts and the media kept telling us that breakthrough infections were "rare" even as it was becoming evident they weren't.