If you don’t have a RSS feed, I won’t see your content. There are only a handful of sites I view direct any more and most likely you are not going to make the cut.
Most blog readers don't share your perspective, and, unless a creator's audience skews very heavily toward a group that does, it would be hard to say the incentives are aligned in the direction that makes a tangible difference for them to support RSS for their posts.
What sacrifice are you talking about? For instance, Substack supports RSS, even for paid items. They just only include the teaser portion in the feed. The paying customers can click though.
These aren't things users care about, but it's what the publishers care about.