@Ars-Vitae there are several teardowns of the Garmins to be found. Even the Fenix 8 Pro has the same SoC as the Fenix 8, Fenix 7 Pro and the Fenix 7 before. Fenix 6 Pro had an older one…
Epix Pro is only the AMOLED variant of the Fenix 7 Pro.
I guess you mean disable touch und just use buttons? At least with watches having crowns it would be possible.
With Garmin there is an option I used all the time “Enable Touchscreen only in maps”. And with the Race S I hardly use the touchscreen apart from maps…