Robert Maynard
Volunteer Moderator
It started in late 2012 / early 2013 - when some of the first backers realised that the design of the game they had backed meant that players would not need to play with them to affect the shared galaxy - and has been raised many times since.It was argued back in 2014 that the 3 modes should be separated and that progress in Solo or PG shouldn't affect progress in Open.
Rejected by FD
While Sandro effectively ruled out every game feature except Powerplay in terms of possibly being made Open only, back in the Powerplay Flash Topics of May'18, we're still awaiting Frontier's decision on that investigation (that Sandro was at pains to state was, in fact, an investigation and not a fait accompli).