Apple is usually first to get their designs in to the OS so everyone else sort of has to or they will be the odd ones out. Especially when most users are on iOS, the expectations are set on what ios displays it as.
You only look odd when you override the OS default. Then You’re odd all the time. Even if you ape it, like web Twitter, you’re still odd, because the small differences are even more pronounced.
Most designers may be on iOS, but saying most users are on iOS is objectively not true, except in very niche apps.
Depends on your target market. In places like India, Android absolutely dominates. In countries like the US and Australia, iOS does. Especially among younger users where iOS has almost universal coverage.
