??
Looking at films from the early attacks on Midway prior to the Carrier engagement Ngoumo's fleet seemed quite easily to manovre out of the B17 strikes as in turn the CV when the bombs were in the air and without a high fighter cap. Maybe we have lost the skill 
Some players have so much experience in sinking TGs...and it's made easier if the TG is parked too close in by sending a lemming stream of kamilancs... hell, even TU's can take them out. The BBs are a bit tougher.
The defensive (cap) #s are not there - very few willing to cap/defend the TG compared to past.
On the flip side, if a TG can get into decent visual range of a base, it can 100% take out all hangars, ords, dar, and wf the town (and then maybe can get an lvt in for a take - not easy.)