In any case, many actually useful sites that disable RSS are public orgs that do not rely on adtech or subscriptions. Its the sad result of digital illiteracy and outsourcing their web presence to some inane outfit thats up their neck in the SEO and social media shit.
Incidentally a Web that makes full use of RSS is also one where more complex protocols like ActivityPub and ATProto can flourish. A client is a client is a client. Now that Mozilla has essentially abdicated their role as a user-centered window to the universe maybe there is room for something else?