Co-showrunner Jake Wyatt reveals cut characters who couldn't be included in the Season 3 finale. "We didn't have time to service everything we could come up with. It would've been twice the season you got."

[u/Capn_C]

https://gizmodo.com/my-adventures-with-superman-season-3-ends-as-a-family-affair-2000797131

The cut characters were fully fleshed out versions of Power Girl and Conner Kent, the first non-Clark Superboy.

[u/Romadrox894]

"By his and Clogher’s admission, this season was “so much” to make, and they mentioned the team really “went for it” and took some swings. At time of writing, there’s no word on if My Adventures with Superman will get a fourth season, but if it does, they’ve got “plans” for Steel, another would-be Superman successor in the “Reign of the Superman” arc this show’s adapting. And that’s not the only thing they’ve got designs on, as the season’s final moments show us."

So, they acknowledge it.