Not technically a fault but there's no benefit to it.
The only bad thing is, if they don't work.
Working 2+2 well separate, equals heaven. :angel:
They can feed up to 4 babies at the same time. If they are good milkers.
I have 2+2 's and 1+1's.
When my does have trips, I never pull them, even the 1+1's, my does are good milkers, either way. The bad part with the 1+1 is that, 1 kid is fine with one side, while the other 2 kids fight over the one teat, cutting their sharp teeth into momma's teat, making a raw and painfully sore teat is horrible.
Some breeders don't have good milkers to cover all 3 kids, so they have to bottle feed,having 1+1 teated Does, it can be very inconvenient at times.
With a 2+2 momma the story is different, 1 to up 2 kids on each side, each have their own teat and there is no fight for one. I rather have the 2+2 teated well spread working teats, than the 1+1, just in case of triplets or quads.
I lost a nice Doe from too many kids scarring up her teat so badly, that scar tissue took over and her milk flow was no longer good in that teat. She was a 1+1 and not 2+2, it was devastating
IMO 2+2 teats have benefits. ;-)