This is a terrible argument IMO. Are you telline that Irving, Trae Young, Horford, Tatum, Brown, Smart, Rozier couldn't win a title? Of course they could.
Nope it illustrated what a terrible premise your two points are in terms of winning titles. A lot title teams had great point forwards too, like the Celtics in the 80s and the 90s Bulls. There is little reason to go double PG,
How about Curry and Irving as your Starting backcourt instead of Thompson. Think they could win it all? Rest my case. It's about the other players as much as anything.
We will never know because this team does not exist. NBA execs don't out together these teams often because they don't win titles. Hypothetically could they win, sure, but it won't happy because neither of them could defend the other teams guards in tough situations. So you better dust off your case...