It doesn't use material 3 yet despite it being introduced 3 years ago. It has its own share UI despite android already having one building a major redundancy as share functionality is one used by a lot of users quite frequently. For example I use OnePlus and hence OxygenOS. My skin has its own design layout for the share ui (and so does samsung in its OneUI or Google in its Pixel UI) and every other app uses that except Firefox which uses its own share interface. Small things like this where it uses its own ground up solutions instead of properly integrating with the mobile OS its operating on makes it feel foreign to the OS, and like a Frankenstein.
