Correct, I don't use PLEX for recording or viewing live. I record a handful of OTA shows for DGF, some older on PBS. My intent was to let you know the HDHomerun turners have worked very well for me over the years and I am confident the newer ones provide as good or better quality. I have occasionally played with the Silicon Dust viewer available for the tuners and the quality there was just as good as on Media Center.
I have ported Media Center from my old Windows 7 server to a newer mini system running Windows 10 but still need to reinstall PLEX on the new server before I put it in service. FYI - Media Center does not come with Windows 10 or later as Microsoft abandoned it after Windows 8 but I found a way to port it that works. I should really look at using PLEX but Media Center has worked so well for me over the years and I am so comfortable with it, I find it hard to be enthusiastic about changing.
BTW - I also use Schedules Direct for my Electroni