Because expunging an endemic disease is a hell of a lot of effort. Zero Covid didn’t work (ask Winnie the Pooh), so most efforts were undertaken instead to weather the large amount of simultaneous harsh cases where patients required a ventilator and constant medical attention.
Would it be possible? Probably, but do you really want to convince Billions of people worldwide to regularly buy and use tests, masks and to distance where possible for a few years? I mean, I’m in Biotech, I’d live a fulfilled live employment-wise - if I don’t get gunned down due to political violence that would ensue.
I mean, yes of course I would, but solely because I somehow voted for Trump.