I assume OP is talking about “me too” drugs. However, there is an argument that they offer a lot of value too. Incremental improvements is why we have a single pill therapy for AIDS with minimal side effects. It took dozens of “me too” drugs to get to that point.[1]
I'm not so much talking about "me too" specifically, that said, I don't feel that minor tweaks to process or formula are deserving of another patent and many years of protections. And, as I said, I don't feel that there should be a single provider at all. The licensing for patents can be worked out, but imho if the sale of the drug required dual, independent sourcing as a requirement there would be at least some push downward on pricing.
[1]https://www.acsh.org/news/2012/05/10/me-too-drugs-are-innova...