I'm going to try to answer the OP squarely, on all fours.
I owned the 17-40 first. It wasn't until I went full frame that I realized what wide angle really was. There was no 10-22 when I owned the 10D or 20D. I was astonished at the view and the ability to get real close up to a subject and still get the entirety in.
I then purchased the 24-70 because I just had to have it.
Until recently, and besides two weddings where the 24-70 lived on the camera, I rarely used either lens.
I'm now using the 24-70 on a much more frequent basis, almost as my walk around lens, while my 70-200 sits in a waist bag ready for use.
My 17-40 is seeing very little use these days.
As to landscapes, which I love to shoot, if I'm going to include people in the shot, such as my family on vacation, I prefer a greater focal length for the compression it affords.
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