I think I saw something about Google allowing greater customisation of the share sheet for apps, hopefully this pushes some apps to move to the native sheet instead of making their own one to add special sharing options.

Then again, YouTube has its own share sheet but it has zero added functionality to justify it, so who knows ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯