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The reason a lot of women’s clothes don’t have pockets is fashion. 
Complimenting form > practical uses
Just an FYI to some women out there who buy garments that have fake pockets, sometimes they're not fake, manufacturers will sew them shut during shipping to prevent dirt from entering the pockets, once you have bought them you can pick the thread away and viola, pockets
Also, you're crazy lady. Pockets are superior to no pockets.
Edit: Actually, this applies to some men clothing garments, too :) >

No one is saying they shouldn't have pants without pockets, we just want more options with pockets. I don't carry a purse, but I do have a phone with cards I keep in my pocket. I don't dress in slacks or form fitting clothing at work, so I don't care if my jeans look "frumpy". I do care that I can't find a pair of jeans in a 100 mile radius with a pocket big enough to hold my FOB without risking it falling out every time I bend down.
If I'm dressing up or going for a certain look, pocketless pants are great.