Extensions, flags on android

Hello everybody,

Hotcake has already talked about it, and after that, flags have been integrated in edge android. But there is also one flag, where are the others? Moreover, why can't we have extensions on edge android? I know that chrome doesn't have it too, but edge could make it. Office extensions, Microsoft redactor, and bing homepage are good extensions, could we have it on phones (and tablets?)?

Thanks