Because even if "Lock automatic tool selection" option is on, you can turn off the auto tool (shift+right click, press the title bar, light goes off). That makes tab switch tools, even if "Lock automatic tool selection" is on.
And of course the corner cases (like editing enum values of an array of enums).
There's a comment on that Idea that lists all the new keyboard shortcuts. Note that the preference for locking automatic tool selection only affects whether or not the Tab key navigates between array elements (because otherwise the Tab key changes tools).
Christina Rogers Principal Product Owner, LabVIEW R&D
Ctrl+Enter inserts an item in an array in LabVIEW 2020 SP1 and later.