When I hiked the PNW comfy tent sites were almost always available. Heck, I used just a foam pad because the duff would be soft enough to sleep on.

But the Sierra, particularly the high Sierra, is a lot rougher and flat sites big enough, especially for a two-man tent can be very limited. You take what you can find and subject your shelter to it.

And don't get me started on popular sites along the JMT.

Cheers,
_________________________
--Rick