If you have a problem with using a Google account on a Google product, don't use that Google product. Use signal, WhatsApp or any other messaging service.
While that is fair, messaging is a bit more complicated since you kinda have to use what other people in your life are using, and almost all of the people I talk to regularly have RCS but not other chat services I'd rather use. If RCS was available outside of google messages I'd gladly use a third party RCS app.
Like I said, its great to have an account option if you can still use it without your google account via the QR code, but loosing a feature unless you use a google account would be a bummer.
To be totally honest it seems weird to me that people would be so invested in debating my preference to not have to use a google account. I was just expressing my personal disappointment that a feature might go away unless I link an account- do I really need to justify that? Can't I just be not-thrilled at something without people telling me I shouldn't feel that way, or that I'm unjustified? 🤷