Most of those pockets, notice, are in the side seam itself -- allowing them to be made without changing the order of construction, but requiring a zipper to keep things from falling out.

I realize that within-the-seam vs, welt pocket is externally a small thing, but it changes the order of construction dramatically. My approach doesn't need a zipper to prevent things falling out, but does need a reordering of the construction process, and so is much rarer to see for exactly the reasons I enumerate in the post, even in spite of being potentially materially cheaper.

For me, the following style allows the phone to slide out when I'm sitting: https://i.ebayimg.com/images/g/7qwAAOSwwpZbd0x9/s-l1600.jpg

This style holds the phone better but I find it too much effort to get the phone out: https://di2ponv0v5otw.cloudfront.net/posts/2019/02/28/5c78a7...

Notice the button: https://www.westportbigandtall.com/ProductImages/37600/37600...