I know it's probably a bit of a disruptive inclusion to this thread - but if you are looking at keeping it simple, you may want to look at the Zoom LiveTrak stuff. It's like a bridge between an analogue and all out faderless digital solution. All mixed from the desk, so no apps or wifi involved.
Full disclosure, I'm shielding and not had any opportunity to see one in the flesh so can't vouch how good they are but it does give you the familiar analogue feel, with 5 auxes (but these are all for IEMs primarily but Im sure you could hook a monitor up - but I'm pretty sure there is not the ability to put a 31 band EQ across them (or the mains) for notching out frequencies), multitrack to SD and will also serve as an interface. Also got some DSP - probably not as comprehensive as the RCF or Behringer... but having said that, I would say the VAST majority of RCF and Behringer users don't make use of the DSP they have available to them anyway.
Anyway, I think it's pretty cool and bridges the gap for people scared of losing physical faders.
https://zoomcorp.com/en/gb/digital-mixer-multi-track-recorders/digital-mixer-recorder/livetrak-l-12/
https://zoomcorp.com/media/documents/Zoom_LiveTrak_L-12_OperationManual_English.pdf.pdf