Mark this is my mint Les Paul and mint Explorer see how Gibson set up the saddles cut just deep enough so the strings don't move around.
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Sometimes, you see old and even new Gibson's with hardly any slot at all. It's all based on how the tech did the setup on that particular guitar. I stick to the published specs. It takes all the personal preference out of the equation.
Gibson actually has a published specification sheet on this which includes the recommendations for slot dimensions at both nut and bridge.
In general, the slot dimensions are string gauge + .004/.006" so a .046" low 'E' string would receive a .050" saddle slot.
The purpose of the saddle slot is to provide a gentle radius for the string to rest in, without any sharp edges to cause string wear and breakage. It also provides an intonation point and helps to maintain the string radius at the bridge.
Here's a good video on the subject...
Again, everyone will have a personal opinion and will generally try to enforce and justify their preference as gospel, or base it on how some particular guitar is setup by the factory.
If the tech on the bench did it outside the specs, then you are following a bad example.
Some of the absolute worst setups I've seen are on vintage Gibsons from the 1950's and I know collectors who keep these guitars in a largely unplayable condition because "that's how it came from Kalamazoo. "
First and foremost, there's hardly any way to ensure that a 70 year old guitar still has the factory setup, just because you have the original, hand-written receipt in the case.
But this just goes to demonstrate how guys will try to justify a personal preference as a fact.
In cases like this, I go straight to Gibson custom shop and ask one of their Luthiers and/or refer to the published specs.
