I think everyone is missing the crux of the original suggestion.
What if each scene contained a copy of ALL properties of the block. Not just settings, bypass state, but also TYPE. i.e. you don't have 4 channels on an amp block, you 8 scenes each which can choose a different amp model with different settings.
Scene 1: Fender twin with scooped mids low gain.
Scene 2: Fender twin with the gain higher because it's a separate instance with separate BMT and Gain settings
Scene 3: A Bogner Shiva
Scene 4: A rectifier
Scene 5: A Legacy
Scene 6: Jazz Chorus with all the effects blocks engaged
Scene 7, 8: etc.
In this model, the LAYOUT of blocks would be fixed between scenes, but every setting in that block (including which block type) would be loadable, rather than just the 4 channels. In fact, it would be a little more like swapping presets instead of scenes, but witht he speedup from always having the same block layout so they don't take as long to switch.
Upside: No longer limited to 4 channels, each scene is like it's own preset except for the limitation of a fixed block layout.
Downside: As noted, you can't set up a pedalboard style preset as easily, where you choose between amp channel 1-4, and then you turn off and on stompboxes as needed. You also would run into lots of cases where you want to copy just a single block between scenes, because your "crunch" preset and your "Crunch with chorus" preset would be two separate instances of the amp block even if they started out the same. Lowering the gain in one would no longer lower it in the other. But copying the scene would override the chorus setting.