I am willing to pay real money for the pets and other rewards from the Hall of Monuments, instead of being forced to spend GW2 time playing GW1. And I'm far from alone in that regard.
Improve pet AI, such my pet isn't running all over the place attracting adds. My pet should always stick close to me, by which I mean the distance to which it comes when I call it, unless it is actually fighting a mob. This includes fixing things like the rock gazelle's charge, which takes it seemingly halfway across the map and out of the fight for several seconds, and the interminable launch time of the fire wyvern.
I've been playing a LB/GS bowpet ranger, which is basically how rangers have been envisioned in the entire history of fantasy gaming, in the GW2 open world for over five years. I shouldn't have to abandon my favorite play style, the traditional ranger play style, just because a raid group is counting decimal points on DPS. Make a pass on ranger weapons to bring their DPS up to equality.
Out of all my pets, I've probably not used half of them at all in over five years of playing a ranger. Brown bear, fern hound, jungle stalker, tiger, jacaranda, rock gazelle, electric wyvern, bristleback and devourers for range, shark and armored fish underwater; that's pretty much it. All the others only get brought out for novelty value or specific situations. Clearly, a lot of pets need a pass made to make them more useful and/or less redundant.
We're long overdue for a dolphin pet. The model already exists in game. Ditto for the other colors of moas, and the "crocodile" scaled drake model from PoF zones. Many other pets that could be added, if only for new looks.