you know what they say about bodies and lenses. if its a focal length you shoot regularly, might as well save up and wait to get the native mount. no matter how good the adapters, they are all a pain to use. which RF lens are you looking to get?
once Nikon and Canon entered the mirrorless wars, most of the theoretical size advantage over DSLR seems to have disappeared especially when it comes to lenses. That is what is giving me the most pause in terms of getting more. It doesn't make for a very unobtrusive experience trying to take pictures with most of them. Nikon has tried somewhat with the Z 40mm f/2 and Z 28mm F/2.8, but if you are like me and this was your first foray into Full-Frame, missing the smaller nature of APSC doesn't go away
as for 3rd parties, both Canon and Nikon have chosen to have a closed system, and so far it seems Sigma, Tamron, Zeiss, Voigtlander are content enough to just stick with the Sony E mount and wait to see if it ever becomes worth their while to expand to RF and Z mounts