As an Android user, it'd be nice if replying "No" to "Do you want RCS?" meant "Never ask me again" and wasn't just interpreted as "ask me again in next week and every week thereafter".
It gets even worse; last week, on a relative's phone, after weeks of clicking "not now" it just force-enabled RCS, and displayed something like a "we automatically enabled RCS for you, here's what you should do if you want to disable it again" (completely confusing said non-technical relative). Needless to say, I quickly went into the settings and disabled it again; I just hope that it having been enabled for a few minutes doesn't mean it will no longer be able to receive messages from RCS users (like the rumors I heard many years ago of people who enabled iMessage and later changed back to Android no longer receiving any SMS from iMessage users).
Some people don't have data but Google doesn't care, they force clueless users to enable RCS anyway and then they're on their own to figure out why they don't receive messages anymore!