I'm subscribed for a month and my OP(Dinged 50 2 days ago.) would now need 5 bars if I put on everything on my bars. So stuff like sprint, quick travel, emergency fleet transport, relics and other useful clicky things are a no go.
The Legacy abilities alone fill half a bar. Yes I'm aware that is stuff that I can only use every 15 minutes while solo at most but it is also stuff I NEED quick access to while solo in the very moment I want to use them. Those are usually last resort reserves to solo champions and the like.