I think the only downside to Textra is that it doesn't support RCS - or I don't believe it does. They have a newer app called Chomp SMS that does. I'm still using Textra because the only communication I get on it is from companies.
Do you have information on it supporting rcs? I don't see anything on the play store mentioning it. The first Google results I see say it doesn't. Seems like it would be a big deal because if they did and would be prominently displayed as I thought only Google messages and Samsung messages supported rcs.