I did butted corners for a number of years. I would put the sides on first, then at the top and bottom I would flip over the binding to sew the raw edges using a tiny machine stitch. It does result in a lot of bulk, and some grading/trimming of the layers is needed. I also tried hand blind stitching the edges which also worked and gave a bit more room to work with, but I was happier with the stitches buried in the folds.
Then about 20 years ago I decided that I flouted the quilt police in so many ways, I would learn to do a "competition" binding just so they would have one less thing to concern themselves about. So now they grudgingly admit my bindings are "correct" but are "too wide". There is no standard and for me it is the last point at which I can add a fabric, so yes my bindings are pretty much always bigger than 1/4" finish, unless I want the quilt and binding edge to disappear. Now I pretty much always make bias double fold French bindings and have done it so much I no longer need to follow directions when I do it. Took quite awhile to get the hang of the fold at the corners and to trim the ends to the right length. I need a lot to do that step, I see some people who can manage it with maybe 3-4 inches each side, I use about a foot of loose ends to work with.
The point of this -- do what works for you and what you want to do.