Here's the "logic" of a narrow at the nut fretboard - I assume that is what we are discussing here when you say "thin" neck.
Let's say you need a 20 Lb package of baby back ribs for the Memorial Day BBQ you're having at your house. The Fiesta Mart three blocks from your house has ribs on sale for $4.99 per pound plus they have the fixin's for the cole slaw you want to make at a good price too. The neighborhood deli/coffee bar/cool hangout place you like to visit has ribs for $8.99 per pound but they are clear over on the other side of town. They don't sell the makin's for the slaw. You happen to have forgotten to put gas in the car last night because you were busy picking up beer but there's a gas station on the way to the deli/coffee bar/cool hangout. It's an easy in/out at that station but they have gas for a dime more per gallon than the Fiesta Mart station which gives you a discount when you purchase groceries. The Fiesta Mart's gas station is always busy.
You know you'll probably see a friend at the "deli/ ... " and you'll get distracted which means you'll spend more time there when there's stuff to do around the house. Plus the Fiesta Mart has plenty of check out lanes and plenty of checkers so you'll get out of there quicker than the "deli/ ... ". There's also a friend you like to visit to play their high end boutique guitar and they are on the way over to the "deli/ ... " So, if you sort of ignore the stuff that needs doing around the house for awhile longer ...
And your daughter wants you to drop her of at her friend's house which is just down the street and around the corner from the Fiesta Mart. You need to get to the store as quickly as possible so you can begin the dry rub and let it sit for the night. The speed limit on all the streets between you and the two stores is 30 MPH and you know the police are watching for speeders over the holiday weekend. You'd hate to get a speeding ticket with your daughter in the car with you since that would set a bad example. And your car is parked up hill in your driveway so you'll have to back out.
Which store do you go to?
Well, obviously, there are a lot of red herrings in that shaggy dog story that have nothing to do with the thinner neck on a guitar. The only details that matter would be the Fiesta Mart is closer to where you are at than is the deli/coffee bar/cool hangout and the speed limit is the same for any direction you take.
Get how that is relevant to a thin guitar neck?
I thought you would. It's pretty simple when you think about moving your fingers from this note to that note. The speed limit of the trip is fixed and cannot be exceeded. Therefore, if you want to make the trip from your house to the ribs in the shortest amount of time, you go where? To the Fiesta Mart because it's closer.
On the guitar neck, if you have your fingers located on a C7 chord and you need to get to a G7 in the shortest amount of time, you want the strings that are the closest to where you are starting out from, right? That's the logic of a narrow fretboard.
Otherwise, as has been posted, its all in what feels best to your hand.
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