I think it affects the accuracy a bit more than "useless". The result i got in a pav xbows shootout against a v0a2 pav and a v1a2 pav was remarkable.

the v0 pav routed with about 20 men when the other v1 pav had about still 43 men. So if you are going to rely on shooters, you may want to add v1 to your shooters. Since i am not one of those I just leave them valourless..