I definitely think learning to S&V is important. It needn't be your "A" game. But if the opponents are returning my serve and coming in, I do much better just trying to win the race to the net rather than trying to hit passing shots for two hours from the baseline.
Can women volley? Well, a 4.0 woman is akin to a 3.5 guy. Many 4.0 women have their default setting as hit the return and come to net. This requires volleying. So yes, women can volley.
As for me, I think my volleys are OK. I work on them constantly. I struggle with pace, and I often don't get as much angle/placement as I should. Despite those deficits, I can assure you that when I was a 3.5 playing 7.0 mixed with a 3.5 guy, the only way we wound up two at net was when I came in.
-- Random Error Generator, Version 4.0
-- Master Moonballer