I really fail to see how the existence of these ports offends you. There is no zero-sum game going on here. This isn't the days when Nintendo would limit publishers to five releases a year. A publisher can release as many games as they please, within their own financial and manpower limitations. If you don't like ports, don't buy them. Vote with your wallet and support the kinds of games you do want and don't support the ones you don't want. There are probably more games being released this generation than any prior, and there are certainly more brand-new games coming out than I could ever possibly keep up with.

Just because somebody is old enough that they could've experienced a game's original release doesn't mean they did. They may have never heard of it back then, they may have not had the money for it when it was available prior, they may not be able to afford current inflated secondhand prices, they may (and should) prefer to buy a legal release over pirating and emulating, etc. You already came up with the proper response to your post yourself: "You're just gatekeeping."

Personally, ports, remasters, and remakes of old games are my favorite thing about this generation. I've been able to buy legal, official copies of games that are ridiculously expensive in their original forms (like the Sparkster games, the Felix the Cat games, Trip World, etc.), and there have also been plenty of games getting their first ever official English localizations (Seiken Densetsu 3, Radical Dreamers, Live A Live, Front Mission 2, etc.). If anybody thinks I should be denied the opportunity to buy things I enjoy, they can kindly shove off. There are tons of games that don't interest me in the slightest, but that doesn't mean I would wish them out of existence and take them away from the people who do like them.