The gaps are the north and south side of the neck are there for vintage accuracy as the 1957-1960 Standards typically have gaps in these areas. The gap between the pickguard and the neck binding is due to the pickguard being poorly cut.
2021 Historic Reissue
Here are examples of original burst pickguards:
Most of the new VOS and Murphy Labs Les Paul Standard reissues I see for sale have gaps between the pickguard and the edge of the neck to varying degrees, they look awful to me. Yet every single Les Paul custom has a perfect fitting pickguard.
I don't buy the vintage accurate shrinkage argument either, a browse through Beauty Of The Burst and watching Joe Bonamassa with his original bursts dispels that myth.
VOS reissues used to have perfectly fitting pickguards up to around 2018, it's since then that the gaps started appearing. Anyone know why? It must be deemed deliberate and acceptable by the factory as so many are turned out like it.
Looks great to me! But considering the small gap around the neck pickup and between the pickguard and neck binding, I wonder if this pickguard might count as poorly fitting by the standards of the OP...
On recent historics I have thought it was both for the accurate gap at the neck pickup and on some it was sloppy assembly.
A couple current real '59s for sale on reverb look like they were fairly well fitted but you can see the neck pickup gap.
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There were two things I would improve on the current models: This pick guard fitting issue and the guy cutting the bridge saddles. I know he was trying to center the strings over the pole pieces but the location of the slots was not consistent for string spacing. I prefer the strings centered on the neck (equal distance of high and low E strings from edge of fretboard with equal spacing between the strings) and not worry as much about pole piece alignment. I know that is OCD but I had to replace and recut the saddles on about half of the new guitars I received this year.
Well, if you want vintage accuracy then a poorly fitting guard is where its at.
Maybe you're just not cut out for this sort of guitar.