From an overall risk/reward perspective, I would include the risk of subsequently infecting your parents, grandparents or other vulnerable/high-risk family/friends with severe disease as a 'potential long term side effect' of covid in a young/low-risk individual.
Thinking about it from a societal perspective, I'm willing to take a small risk from getting the vaccine to avoid inadvertently getting and spreading the virus to more vulnerable people like my grandparents.
Yes, the vaccines may be riskier than we're accustomed to. GBS is a 1 per million side effect in most vaccines, with some proportion of these people having permanent side effects. I wouldn't be surprised if we find that these vaccines are more like 1 in 25k. But that's better than the odds even young people face from COVID-19.