I know nothing about the programming, but it seems counterintuitive to take away shortcuts, especially ones that have been around for as long as those have. I could understand if they had been swapped so those combinations of buttons would now do something else, but they don't.
How many shortcuts are there? I can't see that many in the menus.
Using combinations of CTRL, Shift, Alt and A-Z there has to be more than a few hundred available.