Earlier quoted context omitted.
I refuse to use Facebook's app. It's been years, I don't remember why, don't ask me. Their web app is fundamentally broken in half a dozen ways, and has been for years. A couple examples (not all): If you are in the middle of typing a comment and switch to another app, when you come back, it will reload the display, losing your comment. Video shorts load in a way that hides the video after about two seconds. Editing…
Companies intentionally make their web experiences worse because they can track you better in apps. Even if the trackers are technically the same, even somewhat savvy people using blockers or browser protections generally don't use them on their phones.
Of the tech companies I've worked for, I can't even imagine how the web team would react if they were instructed to intentionally nerf their website.