Well put, and I agree that people have a tendency to procrastinate which can be detrimental to early treatment strategies.
> why has no other country done it?
Since early in the pandemic many front-line doctors have been successfully reducing hospitalization and death through early treatment with a multi-drug approach. Those are the doctors and researchers that authored the publications I cited in my previous comment, especially [1]. Those doctors had to treat patients early in the pandemic with a very little scientific literature and clinical trials to guide them, hence the world wide collaboration in putting together reasonable guidance based on existing medicine with established efficacy and safety profiles.
They continue to use these techniques - which are being further investigated for efficacy and safety in ongoing clinical trials - but with scarce media coverage compared to the vaccines.
So in many ways countries around the world have been doing it to some degree, but it hasn't been the primary strategy, as you point out. Why hasn't it been the primary strategy? Well that's a good question and tough to answer with any certainty. To speculate, I'd say that vaccines had a tremendous amount of funding and media attention poured into them, more so than any multi-drug therapy regime.