I don't understand why this was deactivated from the tools set. The key shortcut doesn't work and it isn't on the main toolbar anymore!!
The eyedropper tool and the "O" shortcut, for which I don't remember the tool name, I think it was exposure ALSO don't work and the shortcuts aren't activating either.
Like most Adobe users I work daily with these tools and instead of improving Photoshop as a program itself it is hurting my workflow, it is very annoying and I am not happy with "upgrade"
C for the Crop tool and O for Dodge/Burn are still there and work at my end. One thing to note, the Crop tool can sort of "go into the background" in which case C won't bring it forward. Tap V for the Move tool then C to get the Crop tool back in front.
As for Crop missing from the toolbar, what workspace are you in? Essentials? Photography? 3D? The Crop tool is unavailable in the 3D work space. Otherwise, try resetting the current workspace