Has nothing to do with any of the above, imo. My guess is Sony needs to keep base PS5 focus for mass consumer appeal and not give too much spotlight on Pro which is the uncontested halo product within the console segment. Comparing to last gen, at $700 we're in uncharted territory from a nominal dollar perspective, even though the value might be equal or most likely even better than the prior gen Pro. I was hoping/expecting they would showcase future games running on Pro but as I thought about it some more, the gap is significant enough to the point where the base PS5 user could potentially be mislead, disheartened by what Sony showcases running on Pro (60fps with fidelity-like graphics, and RT games will create even more divergence) vs what they will get on base PS5. That rarely, if ever, was the case with PS4 Pro, where it was effectively a resolution bump but most games remained under 60fps, therefore when Sony presented games on PS4 Pro, it was the same 30fps.
I expect this could flip once Sony can manage to cut prices, but in the near-term the enthusiast consumers who are interested will be aware of the tech outlets such as DF, NX, and 3rd party developers who can come out to discuss uplifts provided by PS5 Pro on a game by game basis.