But the devolution part made the parts when they digivolved seem more special, and gave perspective on how good the enemies were.
Theyd walk around as rookies, but then would go to champion for slightly stronger enemies, ultimate, and then mega!
In Pokemon on the other hand, you get 3rd stage Pokemon taking on 1st stagers. Not saying it would be better, but supposing Ash had Turtwig all the time, then it evolved to Grotle for slightly stronger enemies, then Torterra for the strongest ones, before devolving back to Turtwig once the battles are done
If anything, it would make all evolutionary stages merchandisable (Agumon, Greymon, MetalGreymoon and WarGreymon toys were all sold at once).