I remember a time long long ago when I was a mere DD that we would be waiting for BBs because CVs filled instantly.
When I finally got my first CV with my friends we would struggle to get into matches. Because they filled so fast.. Nowadays it's the complete opposite which is sad.
I feel the problem is with the exp, sailor death rate, and probably the fact that T3/4 fighters obliterate low levelled T3s and lower.. The poor little level 50 - 75 CV has a hard time keeping BBs happy and getting much credits when his fighters get eaten up. Sure he can bomb, but then comes the flaming about not fighting. He could use locals, but then that doesn't sustain air space long enough.
The point is it is a hard life for the lower levelled CVs. More exp is needed and something less tier based. A BB1 could quite happily help his team and fight a BB3+ if brave and smart enough. A CV1 is pooped when a CV3+ pops up. Sure he can learn to micro and all the other little tricks, but that isn't easy. T3/4 ftrs are just so much faster, stronger, and have much more defense than T1s. And locals don't have enough fuel to maintain the air effectively.
With the paitence of people in this game these days, low exp, inability to hold your own and the pure flaming of trying to level a CV is off putting enough for old players, let alone new ones.