This^^.
Also as the experts said, with very high Dex over 190, you begin to be allowed for Int of less than 370, that is agreed upon as optimal for some xtra mana regen.
But there may be other things to dex that are unknown, as the actual formulas are not posted or exposed by the devs.
The very high Dex Triton may not be too bad for PvP maybe? Not sure. Imagine running away from something that has no slayer has detect hidden if you have skilled it, poison and crit hits and dismounts you and runs at 210 Dex, and has wrestle of 127, heals itself and hits like it does. Not sure. I suspect that any talk on pvp is like opening a can of worms, lots of debate, and can potentially lead to nerfs to pet, so with a little word of caution. But there are templates that run on riding speed and can use tritons.
A little like a Bane Dragon but on steroids, no slayer, and lightning speed for movement, and lots of points to specialize.
Would be interesting to see one of these with magery mastery, and see how it jumps on a pirate ship, clears the crew in short time also.
Too much Dex is not too good otherwise.
But for Tritons, you get what you get for Dex, and they almost always make good pets regardless, even if you are not Garg, and on foot.