I like to think this isn't me, but that has to contend with the fact that I've spent a considerable amount of time making Firefox look and operate the way it did in 2007.
With RSS, I'm struck by the fact that there really isn't a "this era" replacement. Substack seems like the latest attempt, but I think most readers still subscribe via the decidedly last-era email, rather than anything newfangled. I think most people probably only read social media?