How much does tippet size matter

[tomgamber]

I only ever used 7x on high altitude lakes i Idaho. the kind where it looks like the there is no water and and logs are floating in space. And Silver creek. This kind of place. (not my pic)

Other than that between 5 and 3 is where I live. Been going bigger for streamers if I have the time to change lately because it saves flies.

 

[[WR]]

<deleted. irrelevant >

 

[steve98]

What if Gin Clear stream conditions call for using 5 6 or even 7 X Tippet?
But the bite is on a size 12 or even 10 fly?