Catalyst, fka Marzipan, definitely did not help alleviate the concerns that Apple would prefer for the operating systems to be unified.

Them pulling ill-suited features over to macOS, like the Control Center[0] and toggles, also give me pause.

[0] Which lives in the menubar, lacks any keyboard accessibility, and introduced bizarre new interface behaviors, e.g. multi-step dropdowns where you click inside the dropdown to navigate back. Ugh.