Is there a macOS equivalent to Alt+Click/drag in X?
You might get more responses if you tell people what behavior you expect from Alt+Click/drag.
If you're trying to copy something (often a file, but many other things), you can Option+Click+drag. If you want to click on something, then drag it after releasing the click, that's available in the Accessibility settings.
Looks like my question was answered in a sibling thread.
The behavior of Alt+Click/drag is to allow you to click on any part of a window and move the window. It is extremely useful not just from time-savings (no need to click on the top bar to reposition a window), but also to be able to grab windows that are positioned off-screen or beneath another window and move it with a single operation.
You might get more responses if you tell people what behavior you expect from Alt+Click/drag.
If you're trying to copy something (often a file, but many other things), you can Option+Click+drag. If you want to click on something, then drag it after releasing the click, that's available in the Accessibility settings.