Why is it not feasible or in anyone’s best interest?

It’s not that it only lasts 6 months but transmission protection wanes. A lot of vaccines need more than 2 courses to make it last it isn’t a surprise with this one, especially since the emergence of the delta variant.

I’d be interested to see anywhere saying the IFR is the same for flu and Covid because everywhere I look says Covid is much higher.

I agree Covid is becoming endemic and if we are fully vaxxed we can treat it like flu but we aren’t there yet in my opinion.