I got my 24 to complement my 50. I think 35 is a nice in between but I would never want 35 as my widest lens. I purposely go with the 2 formats (APS-C/Full frame) to sort of give me the 24/35 50/80 combo. There is a time I could use any and all focal lengths but I guess that's what a zoom is for.
I agree, I wouldn't want 35 to be my widest either. But I know I eventually want to get a 24 TS-E and a 24-70, so I'll have 24mm covered with those.
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