Heard the same from industry types re: the Textron gun's complexity. However, those same industry types often comment on how well it runs so....who knows.
It's a shame 6x45mm SAW (not the necked up .223) died. There's some fearless wildcatter's messin around with 6mm Hagar/FatRat/Grendel and all that stuff and it seems like a potential sweet spot for mag/ammo size, BC, bullet weight, recoil, etc. for a carbine and light-weight SAW/LMG. With all this talk of hopped up 6.8mm stuff, I think of the ICSR (the potential re-intro of 308 battle rifle) and the criticisms that idea (rightfully) received. In that...what's the point of all this heft, recoil if the average Joe can't a) get there without being a heat cas/spinal injury and b) not hit when he gets there due to lack of training.
The LR gun-gamers figured out quick, fast and in a hurry that 6.5mm ups hit probability over 30cal and their zingy little 6mm GayTiger's, Dasherbois and whatnots are flatter and lighter recoiling more so....barrel life be damned. The military is just taking a really funny approach to a very similar...and timeless (google "Project SALVO" and SPIW) problem we've never overcome for non-special operations. This is of course we're still thinking of fighting the last war as we tend to do...and long-range BC will matter.