I do a lot of screen capturing, for different kinds of use. Some for use on mobile 16:9 screens, some for just inserting into web text, some as profile photos in 1:1 or 2:3 and several other use. I guess after having used one system for years I notice differences that effect work flow routines.
I think your good software would get an improvement by adding a menu option ”Preset crop ratio”, to the Edit menu, with no relation to image size, centering, largest or anything like that. Just the length/width ratio.
Suggestion to default selection ratios
Special ratios perhaps via Settings menu
A possibility to swap the crop relation, like 4:3 to 3:4 or 3:2 to 2:3, by a short cut, like Tab. You know switching from Landscape to Portrait.
After Capture editing will always be there and I guess we will always find something that could minimize work friction.