> It seems to be an evolutionary trend where the virus mutations that are successful became more transmissible and less deadly (probably because a dead host doesn't spread as much as an alive one).

Covid spreads while still being non-symptomatic so that explanation doesn't stand that much. Flu is not getting milder.

Also, how many times more do you think you can get hit in the face by Manny Pacquiao instead of Mike Tyson and survive because his punches are milder ?

How many times can we keep catching mild covid and escape long term damages (edit: and death and everything in between) ?