Thanks for your posts but I think @moudy explained why pretty clearly. If there is a bug in the mobile web version that doesn’t match up to the codebase in the mobile app (for example) it doubles the work for the engineers to resolve. This way I would think that more bug fixes and improvements can be implemented in the future.
I think adding back the undo/redo button somewhere beside the history button would be great, instead of clicking the history button and reversing it from there, which can be a hassle and annoying if you accidentally messed things up.