They could include both the improvement from the last Intel model and the previous Apple Silicon model, no?

EDIT: I see they actually do just that for some specific applications.

Less is more. I'm guessing the % of M2 customers that are upgrading from an M1 is less than 10%. If ~75% (my guess) of target customers for M2 are Intel mac owners, Apple should focus on them first. They can then do more targeted ads w/ relevant stats to win each subgroup in the remaining 25%

That's a tough cookie, some can't switch due to software constraints (e.g. CAD engineers using solidworks etc)