when I say home hubs, I mean home hubs, and only home hubs , which is the aTV or HP, not any other device that happens to have hub in it's name. Or anything that you've decided is a "virtual hub"
Pretty much all homekit traffic goes though the home hubs. so if your homekit traffic is slow or wonky, I'd start with rebooting the home hubs.
Rebooting any other hubs might help those devices, but unless you do the home hubs, you haven't addressed the one thing that's common for ALL of your homekit devices.
so your traffic goes
iPhone-> home hub -> hue hub -> hue light.
iPhone -> home hub -> home bridge -> LG TV
iPhone -> home hub -> Panasonic TV.
if you don't reboot the homehubs, then the traffic path for a lot of your devices hasn't been touched at all.
the appleTV has apps for YouTube, plex, and appleTV+.
for the most part they're better than the ones that are on the TV.
Not sure what you mean by "choice of speed", With the aTV and the Siri Remote, the siri remote controls it all. In daily use I never touch the TV remote. Siri Remote powers on the TV, controls the aTV, and controls the volume on my soundbar.
Siri Remote is much faster, I can hit the power button, it turns everything on. Then I hold the siri button and say "search YouTube for cat videos", it launches YouTube, and takes me to the search page with "cat videos" already filled in
and to avoid confusion
AppleTV = hardware box that runs apps
AppleTV+ = Apple's streaming service