Patents are not, at their core, a good thing. They are nice for an idealized and transient scenario, but the reality of capitalism is that the vast, vast majority of investment, production, etc. are done by a handful of large companies, and that includes R&D. Patents are, in reality, overwhelmingly one of the many tools large corporations have to shut out upstarts. In short, it entrenches the power of monopolies, trusts, and similar large businesses.

And that's without even starting on how the law can be abused and, with the way our legal systems work, it is fundamentally more abusable for the side that has more money and can afford top corporate lawyers to concoct convenient arguments, leaving little Jimmy in the dust.