For me, it only affected phone numbers that I had exchanged texts with that also had RCS enabled. Phones that didn't have it enabled, or numbers I had not exchanged texts with, were unaffected.

This was quite a while ago. They may very well have fixed the issue since then.

And yes, I noticed they enable RCS by default. Since then, the first thing I have done with new phones is to disable RCS. If you do that before sending/receiving any texts, then there is no issue.