The problem is we haven't seen how the new abilities change the Summoner so it's impossible to make in argument about what needs fixing. Right now people are making an assumptions based on what little information they have and not coming up with reasonable solutions that can work within Heavensward. One suggestion based on Allagan Summoning is have a trait that temporarily transforms the player character into a Primal of their choosing and gaining the Primals skills. SE can also have the player temporarily transform into Bahamut while under Dreadwyrm Trance and gain his abilities.