"That the President of the United States is hereby authorized, in his discretion, to declare by public proclamation historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest that are situated upon the lands owned or controlled by the Government of the United States to be national monuments, and may reserve as a part thereof parcels of land, the limits of which in all cases shall be confined to the smallest area compatible with proper care and management of the objects to be protected"
I would say that while designation as a National Monument was warranted for parts of the Bears Ears and Escalante the authority to designate a National Monument was abused in this case. Far more than "the smallest area" compatible with protection was designated.
If we want the remainder of the area that has now been reduced to be permanently protected from development then Wilderness designation seems the more appropriate route.
What were the objects that needed protections? Do they still have them?