What do you think about using a keyboard-based workflow: hit Super button (or click on Activities) to make the fullscreen menu pop-up, then write the first few letters of the app name, and finally hit Enter? Search-based workflow is my favourite way to navigate app menu, on GNOME and KDE alike.
sado1
Maybe it's obvious, but how about Kodi?
It has support for CEC (for utilizing your TV's remote through HDMI), of course there are other input options as well.
There's plenty of plugins to support online video services. Needs some work to configure them, and sometimes it requires maintenance when a plugin stops working, but I was in general happy with the way it worked while I used it for a few years.
I imagine Meta will simply want to ensure that all content will be added on their servers. This allows to enshittify it for everyone (Threads users and those who federated alike). Federated instances will see the amount of ads included with Threads stuff, and will have to defederate. Then Facebook says 'hey, we made it possible to join us, but nobody wants'.
Mobile Linux distributions for smartphones might offer some hints on how to tackle your problems - these apps are created in a convergent way, which makes them work well on laptops, tablets and PCs alike. Look for an alternate file manager, for example, to replace Nautilus. Check out https://linuxphoneapps.org/apps/