Rockstar's launcher has never given me any problems with RDR 2 or GTA 5. I've got 1100 hours between the two. Actually, I quite like it as it tracks game stats and challenges and I can compare to my friends. I rather quite like it. Probably the kiss of death to say you won't have problems, but yeah, you won't have problems.
And I have to think that it is a first party launcher, since it's Rockstar