I've seen these configuration tables stuffed to the hilt as well over the years. David, you probably remember the days when environments with ridiculous amounts of configured Labels took FOREVER to open a Label node in Script Editor. Luckily they made that more efficient somewhere along the way. Regarding actual limits, I believe they just started to add the Configuraton Limits & Scalability Constraits to the BOM beginning somewhere in 8.x. I don't believe any of these to be enforced in the code itself but rather just the guidelines Cisco wants us to work within. Of course, like anything else, there are exceptions. See section 5 in doc below. I've also attached a snapshot of the relevant objects you referenced.
