I don't think patent law should be concerned with what inventors "deserve" in some moral sense. I think their purpose should be socially practical.
The socially practical effect of working patent law is that it incentivizes inventors to publicly document their inventions by offering limited exclusive rights to the invention. To that end, an overly broad claim to hypothetical inventions which are not actually documented in the patent is detrimental and instead stifles innovation.
> I don't think patent law should be concerned with what inventors "deserve" in some moral sense.
"Deserve" in itself is a meaningless word, a tribal signal. It's interesting to figure out what different people actually mean by "deserve" when they say it (followed the procedure, fulfilled the agreement, expended a sufficient amount of effort, suffered, were responsible in some way for its existence, is alive, has not taken from others, is loved) but there's nothing really there to base anything on. It's a political word.
The real world equivalent is "is entitled to."
edit: it doesn't help that the philosophical area that focuses on what people "deserve" is called "desert." It's one of the cases where where English sorely needs Spanish-style accent markers. "Desért."
What someone "is entitled to" is of course also largely a political phenomenon, a social construct. Just like the idea of what someone deserves it supposes a principle according to which that can be said. For example, ideas of what people deserve according to moral principles often precede legal principles that entitle them to that. But it is only in terms of those moral principles that someone can deserve that, and in terms of those legal principles that someone can be entitled to it.
The socially practical effect of working patent law is that it incentivizes inventors to publicly document their inventions by offering limited exclusive rights to the invention. To that end, an overly broad claim to hypothetical inventions which are not actually documented in the patent is detrimental and instead stifles innovation.