I get that but little OCD with Steam games/screenshots etc, it's nice to have especially for a game such as GTA.
I got the Steam version when it was £24 in the Winter Sale. It has now rocketed back up in price though - hard to find under this price for the non-Steam version.
Getting the Steam version is worth it. You then don't need to install the Social Club software, the game just runs through it when you launch it directly from Steam. You have to log in to your Rockstar account of course, but other than that, not used at all.