Thank you, I was unaware of what function muzzle brakes performed.
Recoil is an issue with follow-up shots, not the initial shot, which comes into play with semi-automatic rifles. With a bolt action rifle recoil doesn't impact accuracy unless you are afraid of recoil and anticipate it.
Your point is valid, but...
If the rifle kicks less, I shoot it more. If I shoot it more, I get better with it, faster.
I don't really get a "flinch" response from shooting a Mosin (or anything in the .308, 54R, 30-06 range of power), but I do start to feel it by the end of the day.
Downside to muzzle brakes is noise and toasty fingers. Brakes tend to push the concussion wave back and to the sides, which can be a bit obnoxious on the shooting line, and absolutely brain shattering if you forget to put your ear-pro in.
Given the length of a Mosin, I wouldn't expect toasty finger syndrome to be a problem. But I do notice it on my AR. I have a very aggressive brake on my AR, which holds the muzzle absolutely flat when shooting - great for rapid follow-up 3-gun style shooting. But it's so aggressive that I can feel the hot gas on my fore-grip hand.