Back a few years ago I posted a thread comparing swaro el vs meopta 12. I timed that I can hand hold them close to two minutes before I need a rest. I have a few 8s, the 12 el and meopta 15. The later weight becomes a challenge more so then the magnification. But 12 vs 10 vs 8 I believe reveals how unsteady one is positionally.
If you can barrow a 12 vs your 10. See for yourself how you individually fare. Hand hold a target with details that’s close say 100 yards to take magnification off the table. See which one has more detail.
Doing this myself and 400 yards and in 8 alpha beats 10 12 and certainly 15 alphas. My 26 oz ZEISS fl only gives my a few seconds fatigue advantage over the 35 oz 12 el. I actually placed deer mounts in trees for this test.
Now slightly stabilize (not a tripod) and things start to change. Personally I can’t get a bino harness to ride high, and i carry in a shoulder rig so I like it lower. Standing, I get my elbows on the harness and the micro shaking begins to disappear and the higher powers begins to separate - beyond a few hundred yards. Not as stable as tripod but remarkably so for standing.
As many have stated, a leap was taken and most are pleased. I think you might be over thinking the hand held shakes thing based on a the “product” - but if the 12 makes sense for your nearly a mile of spotting game get them and go into thinking you may need to tweak your “form” to get the most while hand holding. In this case swaro has added an option to stabilize is a bonus.
My 2 cent into the kitty.