I guess it really comes down to WHAT type of ride your doing??
If it’s a 2 hour workout with varying wattage/cadence etc, OR a 2 hour ‘free ride’ where the terrain/gradient changes, you’ll probably want to keep the zwift (or other app) screen as the main one, because otherwise the resistance changes will be an annoying surprise…
But, if it’s literally 90-300 minutes as a custom workout set at, say, 185 watts, then you can sit on the turbo spinning away, whilst watching a film or something else….
I did 1hr 45 workout today (purple unicorn) and though it was both long and hard (fnar fnar) it wasn’t boring as i was constantly awaiting the next interval change etc…..
DrP