Why no Size modifiers for Stealth?

[Gothhog]

How can a 15 ft. Frost Giant(level 9) have a Stealth of +17 (and +21 in snow).
With a level of 9 and Dex mod of +0 they would have a Legendary (Lvl+8) Stealth if they were bound by the same rules as a PC.
Frost Giant Stealth technology has evolved a lot since Pathfinder 1 (Stealth +2 (+6 in snow))

And why are dragons harder to spot the bigger they are?

A young blue dragon (Large) has Stealth +15 while an Ancient Blue dragon (Huge) has Stealth +28.

Oh look what a Huge Blue rock I found!

How would you modify these ridiculous Stealth modifiers in your game?

[Franz Lunzer]

The big bonus for a dragon doesn't help it if it has nothing to hide behind.

Hide

Hide [A] wrote:

You huddle behind cover or greater cover or deeper into concealment to become hidden, rather than observed. The GM rolls your Stealth check in secret and compares the result to the Perception DC of each creature you’re observed by but that you have cover or greater cover against or are concealed from. You gain the circumstance bonus from cover or greater cover to your check.[/b]

[Gothhog]

Franz Lunzer wrote:

The big bonus for a dragon doesn't help it if it has nothing to hide behind.

Hide

Hide [A] wrote:

You huddle behind cover or greater cover or deeper into concealment to become hidden, rather than observed. The GM rolls your Stealth check in secret and compares the result to the Perception DC of each creature you’re observed by but that you have cover or greater cover against or are concealed from. You gain the circumstance bonus from cover or greater cover to your check.[/b]

True, you need cover to hide and larger creatures need more cover to hide behind. But the largest dragon still more silent than the small ones, and as soon as they have the option to hide far superior at stealth than smaller dragons.

[shroudb]

Gothhog wrote:

Franz Lunzer wrote:

The big bonus for a dragon doesn't help it if it has nothing to hide behind.

Hide

Hide [A] wrote:

You huddle behind cover or greater cover or deeper into concealment to become hidden, rather than observed. The GM rolls your Stealth check in secret and compares the result to the Perception DC of each creature you’re observed by but that you have cover or greater cover against or are concealed from. You gain the circumstance bonus from cover or greater cover to your check.[/b]

True, you need cover to hide and larger creatures need more cover to hide behind. But the largest dragon still more silent than the small ones, and as soon as they have the option to hide far superior at stealth than smaller dragons.

They have hundreds+ years more experience in how to hide than smaller dragons.

That's all that the higher base shows.

It's STILL tougher for them to do so since it's kinda hard to find trees with huge+ circumference trunks and 30ft tall grass generally.

As for gliding/flying more silently, again: experience, fundamentally they've been doing that for a far longer time than younger dragons.