The Y-Wings replacing the 'Ug-Wings' would have been bearable. There's even a variant of the YWing in the Clone Wars series which has a gunner pod behind the cockpit and all its panels intact.

But the fact they have split wings and are red and white is meant to suggest it's a predecessor of the X-Wing. Which makes no sense.

The Ywings would make a bit more sense as in ANH they're beaten up and don't make up the main bulk of the ships. Suggests they've been salvaged.

But my main complaint about the ARC-170 is that it's just hideous!!!!