I replaced mythtv with tvheadend on the backend and kodi on the frontend like 5 or 6 years ago.
The setup and configuration at the time on mythtv was slanted towards old ( obsolete ) analog tuners and static setup and tvheadend was like a breath of fresh air in comparison where you could point it at a DVB mux or two and it would mostly do what you want without having to fight it.
I’m not sure how much longer I’ll want something that can tune DVB-S2 and DVB-T though. Jellyfin and friends handle everything other than legacy TV better than kodi these days.
Razer mice and keyboards can be managed with openrazer under Linux. I still use deathadders on a few Linux machines ( and one Windows games PC ) but I’ve ditched my razer keyboards for keychron which don’t really need any software. You can configure the RGB components of them all with openrgb if you want in Linux and Windows.