Which seem to me like the same number of keypresses. In my case, it’s one less. The only main difference is the order of that one enter-key being afterwards. And, by using that key as a confirmation-step, you get a whole bunch of extra functionality that you say you don’t use. Which, if you don’t use it, will still give you the exact same functionality, and doesn’t affect you.
Consider if you ever need to repeat the screen grab 10x times, the difference is:
Your preferred approach: 10 x (3 key press + click drag release). In total 30 keys, 10 mouse selections.
On my system: 1 key + click drag release + 1 key, 9 x 2 keypress. In total 20 keys, 1 mouse selection.
I find it fascinating to care so strongly for something that is objectively a worse approach in every single way, with the only difference being the ordering of one keypress. And to care so strongly about that one keypress, that the optional versatility that gives (toggle video recording, adjust rectangle, reuse rectangle, move rectangle with same dimensions) is all in all considered a worse alternative. To each their own, and UX design is arguably not yours.