Material or not I do think that mobile UI's on Android and iOS are starting to converge more and more. Lot's of apps look very similar on iOS and Android and it doesn't have to fail alien at all, if well executed.
It can also be attributed to laziness on the part of the PM and/or designer. Or in general, clients opting for cheaper solutions when hiring an agency to build apps for them.
I say all this to point out that, Android users often get the short end of the stick when it comes to app design. Often there is a strong lack of consideration on what is a native Android app feel. No consideration for the use of back-buttons, menus and UI elements using bottom navigations or custom ones instead of native Material design... Generally convergence is made for all kinds of reasons that ultimately leave Android users alienated.