Yes it does.
There simply no reason for Ro.E. to be able to get 3 weapons + mine sweepers.
And they still are very bad in actual combat despite all of that because:
As for the vet for heavy sapper the have some of the best numbers once they are vetted.
REs get ZERO accuracy vet.
Neither construction speed, nor repair speed helps them in combat.
Vet 1 affects EXCLUSIVELY their SMGs.
33% rec acc isn't going to help them out at all, because again, they have ZERO accuracy vet.
-10% reinforce cost helps against attrition, does absolutely nothing for combat potential.
So:
(Pls check stat before posting)
I mean... sure, you're right, if you add all the numbers, you will see some of the highest numbers.
But if you take a moment to check what these "high numbers" actually affect, you will see that a total of their combat vet stats, assuming we're going your "overpowered tripple LMG" route is:
-33% rec acc vet
And that's it.
That is all the combat vet they get.
Their scaling, except that vet3 rec accuracy is exclusively paid through upgrades. They do not scale otherwise.