You do not get the "most" utility, and if the CQC is decent, then royal engineers are due for a massive nerf.
I've avoided comparing them since I've wanted stick to EFA matchups, but when you take pios and RE and put them side by side you should instantly recognise that pios are either cost inefficient or that RE are too strong for cost.
They have nearly identical weapon profiles, but RE start out with 0.9 RA while pios are 1.0.
Pios get better offensive vet, but RE get 5th man upgrade which gives them a rough equivalent to pio vet damage increase while simultaneously increasing their durability.
RE can snare to make up for IS not having them, but in exchange IS can be upgraded with pyrotechnics which let's them spot like pios -and arguably do a better job of it.
RE vet reduces their reinforcement cost which takes a squad that is already very durable (5 man, 0.59 RA with vet) and makes them even more cost effective. And this isnt even getting into weapon upgrades.
Those 200mp pios with 25mp reinforce arent looking so good compared to 210 RE with 23mp(at vet 3) reinforce.
Now in my opinion RE may be slightly on the strong side, but not by that much. They fulfill the roles they need to adequately, and arent oppressive despite how strong on paper they can get. It's just that pios are on the weak side.
I agree that wfa armies are a different beast all together and comparing them to efa they makes efa look bad.
But people only look at the direct counterparts. And dont see faction and tech composition differences.
Both usf and ukf dont have sturm pgrens or obers or like ost a very good stopping power mg in t0. And you cant expect rifles and tommies to be good at everthing and provide everything. Sappers and rear echelon do and must help in this regard.
This imo makes sappers rear echelons mostly fine. You do need to tech bolster (get to vet 3) nades racks and buy weapons to have them at their peak combat wise.
Tommies need to buy their extra sight range. Go nack to 280 mp. But their mobile on the move blob heal needs a nerf just as the okw on the move blob heal should.
Pio have units that provide close range dps much better then they do. The get a t0 mg with the best inf control power for its price and timing. Pio,s dont need to be excelent fighters because of this. They got that extra sight to better sync with their team weapons wich ost relies on more then other factions. They can also heal them if need be.
So imo still all pio,s need is shared vet and this goes for ce,s as well.