I've run Kodi for a while, raspberry pis and fire sticks mostly. Right now the best setup I have is on old Chromeboxes running libreelec or retroelec if I want gaming. It's pretty great. Chromebox G1 is like max $50 or less. They are way faster than any non X86 based hardware I've tried. The only downside is the lack of HDMI-CEC so I have to use either my phone, a gaming controller or some sort of Bluetooth remote to control it. I have installed Bliss OS on some Chromeboxes and it works well but haven't tried running Kodi on top of it. Might work well if I need access to any specific apps.
The silver lining is that I have been finding some better alternatives to both Chromecast and YouTube. I have some Amazon Firesticks with Kodi installed that are pointed at my media-filled NAS, including videos I fetched previously with yt-dlp
I am also considering moving everything over to something like Intel PC sticks and possibly running Kodi off of those eventually. Then I can have all of the smart features I need without any ads or without any of the devices obsoleting themselves beyond my control