Most class features don't have upgrades.
There is no extra action surge amulet
The difference is that action surge is already plenty while sneak attack damage is very far from being overpowered.
I'm a simple man. I see clearly a lot of design space for a rogue build with more than 10d6 sneak damage at level 20, I ask myself why on earth there are no official ways (subclasses, items, what have you) to create a Rogue that ends up with 12d6 or 15d6 or 20d6 sneak damage at level 20.
It's inexplicable and incomprehensible. Nobody ever argued that the rogue is such an overpowered damage dealer that sneak attack damage absolutely can never be increased, which is the impression you get when you observe absolutely zero avenues for improvement across dozens and dozens of official supplements.
Some of you have argued the Rogue is fun enough with plenty of other toys to play with (movement, skills, what have you) and I'm not saying the opposite.
I am, however, saying that this is not a good reason to deny players the option to exchange those toys (to some degree) for more sneak attack damage. Nowhere have I asked for all the toys
and also more sneak damage. (And when the game does give you just moar damage, it never occurs to the game to offer the GM the option to provide an item that increases sneak damage
specifically)
The build choice where you play the Rogue as a glass cannon is a perfectly viable build choice. It will not distrupt gameplay and it will not be overpowered. (It might even be slightly dangerous)
But the gist of our discussion remains: this is a reasonable build choice the game absolutely refuses to deliver.