Rockstar are very greedy, without PC day 1 release they will gain a lot of money just from the online, then they will probably release the PC version 2 years later for extra money.
Ironically i main gaming on PC, however when it comes to Rockstar i just buy their games on console, i dont have them on my PC. I dont want to double tip them and i buy their games on the console to let my sibling and relatives play them.
For some reason Rockstar games are popular with casuals and teenagers.