What do you mean 4 short? 
There are 59 shrines in the base game (50 max points) or 71 with AoM (max 55). You can’t be short, even if you stay out of the rogue-like dungeon areas. And shrines always drop loot whether you’re at max points or not.
Adding new T3 constellations will merely shift the focus, I’d guess. If every fire build is currently choosing Torch then a new T3 fire constellation will only do one of the two things: If it’s better than Torch it will be chosen 100% of the time and Torch will sit sad and unwanted in the sky. If its worse than Torch the new one will be chosen once for testing, then specced out of in favor of Torch, leaving the new one sad and unwanted in the sky.
Stuff like Aeon, Dying god, Ishtak or Emyrion goes in the right direction I’d say.
“Short” in a way “There are more shrines than you need” though some of em are quite hard to get.
Yes, you get (better than average?) loot, but still it feels a bit less rewarding than getting constellation points.
Yes, it is a balancing issue and QoL to not need to wait end of ultimate to finish your build, but still…
Personal opinion and a good thing, but as said sort of wish there could be something more besides the loot to gain w/out beign unbalancing, maybe an unique quest?