Anyone ever use valve/lash tuning?

I fully realize that in an ideal situation the right and best way to set valve lash is to soec when everything else is ideal. BUT WHEN THINGS ARE NOT or WHAT A MINOR DEVIATION FROM CENTER ACTUALLY DOES to for example craning compression etc. Ie cause and effect.

I am curious what one can do with minor adjustments in lash on a solid lifter set up. I should have stated this earlier.
He goes through that in the videos i posted....