Two months ago I took a Gen 2 Razor off the shelf where it had been sitting in rings for 18 months and put it back onto a rifle that had the been completely disassembled down to the bare receiver (barrel removed) twice in that time and the first group was 3/8" right of center.
Two weeks ago I pulled my old match rifle out of the safe where it had been sitting unfired for over a year and went to a "just for fun" progressive elimination match without checking zero. The first round fired from it landed 2" left of center on a 9x11" plate @300 yds. 5 of the next 6 rounds hit the same size plates @4,5,6,7, and 800yds with a 30 minute break in-between each shot.
It's not uncommon for a competitor to adjust their zero only once after a new barrel is installed and never need to adjust it again until that barrel is shot out and replaced 2-3k rounds later.
What I'm saying is that quality rifles with quality day optics hold zero within 1/4" or better, and I know people who run an 1/8" offset in their Kestrel because their rifle is zero'd "in between clicks"
I wish I had made a video of the previous composite bodied thermal I owned while it was on my test sled. The amount of flex in the body and mount while pressing it sideways with moderate pressure like would be found in a foam rifle case equaled well over 3" @100yds. It would come right back when pressure was releived though. A typical day scope will slide the 60# sled across the concrete before it flexes 1/2". The quick detach mount that came with my other dedicated thermal is horrible for RTZ after removing it. In excess of 3" shifts just based on how it's tightened down. Ironically, both of the previous 2 scopes held a reasonable zero within 1" if they were left on the gun. Just by looking at the mounting system my Yoter-C uses to attach itself to the Objective you can tell that it's not Ridgid.
I'm not trying to be argumentive either, these are just my experiences and observations based on my experience as a consumer and somebody who has shot over 20k rounds over the last 8yrs. I understand that expecting a thermal to hold zero as well as a mechanical scope isn't realistic, but I think we're seeing 2-3" shifts because the manufacturers believe that's acceptable and anything less just isn't a priority for them. Go look at some reviews on thermal scopes. Image, image, and image appear to be the top 3 concerns people want to talk about, followed by recording and wifi at #4 and image in crappy weather again for #5. Throw in a few "tactical" reticles that are useless for anything other than looking cool, and they sell like hotcakes.
P.S. I don't know who Skinny is, so please don't take anything I said personally. You made a lot of good points and obviously know some behind the scenes stuff.