I think this idea strongly aligns with Tildes philosophy of promoting "quality content", what is more quality than knowing a poster is qualified to make their claims. It separates the pseudo-science from the science.

I understand it is perhaps a cumbersome process to verify qualifications but the reward in return for having verified experts validated is hard to overstate.

I propose the flair be global and not restricted to within a group(as opposed to reddit) because if we're certain the individual has credentials that still remains in effect when they comment across disciplines. It also removes redundancy and allows the individual more freedom to branch to other communities.

The idea being if someone has a PhD in math they can flair their name with something like "PhD: Math" per post if they wish. As this is a voluntary addition (not collection) of user-data I don't think it goes against Tildes philosophy.