It's too much, in my opinion. The M-14 was always seen as an upgraded Garand.
That's definitely the BM59; the M-14 was a colossal boondoggle of a jobs program for procurement and testing guys. My Beretta Truppe Alpine build consisted of 1) shortened op-rod, 1) shortened barrel, 1) simplified gas block/tube unit, 1) new forward magwell catch/guide rod seat, and 1) bolt release to replace the en-bloc latch. Everything else was either identical (FCG unit), an inevitable improvement for any new configuration (pistol grip stock, folding stock, muzzle brake, bipod), or so similar as to carry no additional cost (new sight elevation drum)
FWIW, the BM59 was no more controllable on full auto, though I suspect if the tri-comp had been used on the M14 (or if the BM59 hadn't been lightened/shortened so much) the results may have been more positive. Ultimately, a full auto lightweight 308 is stupid for heat dissipation and ammo-consumption/weight reasons even more than for excessive recoil. There's a fundamental reason you still need LMGs (FN-D) vs. battle/assault rifles (FAL)
I personally believe one reason the Garand/M14/M1A/etc family are so uncontrollable is because the action is incredibly front-heavy; they are nearly unique in how short the metallic portion of the action is from the breech to the end of the receiver, and even then the majority of large and moving parts are well in front of the trigger group. You have a relatively large, heavy piston/op-rod/bolt group (which is still fairly lightweight for the power of the cartridge) slamming around inside a rather skeletal receiver, way out in front beneath the barrel for the most part. The leverage to control the rifle from way back at the butt of the stock is just terrible, unless you drastically shift the center of mass with a heavy stock (and even then, the center of mass for the moving parts is still way out front)
I have fired A B.A.R. a fair amount, and it is far easier to hit with the selector on low rate of fire.
You think an FN-D with pistol grip, shoulder hook, additional rate-reducer, and quick change barrel might have been even easier? Ergonomics is most certainly the key