For 321, there are 3 dps, 2 tanks, and 1 support. Wouldn’t that not be enough support?
No it’s 1-3-2. which is 1 tank, 3 dps, 2 supports.
1 Support is basically unplayable, as confirmed in that Dev post.
Jeff explaining it:
I would much rather have 222 than 132. I love combining rein and Zarya.