I think their main focus was to transition Summoner from a sustained DPS playstyle to a more burst heavy class. However, a lot of it was kinda half-assed because you can't just delete the pets or the Dots (well, not all of them at least lol). It's also a bit undertuned atm, but once they fix the numbers that'll be the general idea. I always jump to the top of the dps list once I get bahamut out, but then fall back whenever he goes away.

Also, Garuda applies a magical resistance debuff on the enemy, and ifrit a physical resistance debuff. There's also devotion, which I also think is clunky and undertuned atm, but they still clearly want this to be a pet class, which sorta runs contrary to the newer burst style they are trying to go for. Maybe they're trying out some sort of hybrid and seeing where that goes. I don't like the playstyle, but I don't hate it either. I still play it though because I love bahamut.