We all seem to have some favourite "web only" features that exists on the website but not in the apps, and there's a very long tail of small feature inconsistencies, each of them missed by someone.
A low hanging fruit improvement would be offering a jump to the web version on screens like activity and profile, from within the app, either in a webview or to the system browser (this might need some tweaks to carry over authentification and prevent the "open in app" matchers registers with the OS to fire). The result would be an easier user interaction path to the browser as a fall-back UI.
This would greatly reduce the "inconsistency cost" of allowing web and app teams to innovate without excessive coordination. The list of feature inconsistencies is long and it will likely never be completely worked through to the end, so the "mitigation link" would alsways have seome value. And perhaps working off that list of missing features shouldn't even be attempted, because browsers and apps have very different thresholds for "too much clutter".