I think this is a wonderful point. I have elderly parents who depend on the web and mobile apps for a lot of the logistics of their everyday life, so I see the harm that this causes. The constant forced updates (looking at you, Windows) represent arbitrarily moving goal posts, UX-wise.

Gratuitous animation, new "social/platform" features, notification-spam, new "design languages", and etc. benefit the elderly even less than they benefit the rest of us - rather these things actively hurt them when basic things suddenly become confusing and difficult without warning. We've made digital technology mandatory for most people, and we've made it unnecessarily bewildering for a big subset of them, basically by pretending that all users are youngish, digitally-fluent, time-rich, and open to unasked-for "innovation".