The Nikon warranty is different from Vortex and other lifetime warranties - it doesn't cover accidental damage where the Vortex warranty is:
OUR VIP WARRANTY IS ABOUT YOU, NOT US.
VIP stands for a Very Important Promise to you, our customer. We will repair or replace your Vortex® product in the event it becomes damaged or defective—at no charge to you. If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition.
You see, it doesn't matter how it happened, whose fault it was or where you purchased it. If you ever have a problem, no matter the cause, we promise to take care of you. You can count on the VIP Warranty for all Vortex Optics riflescopes, prism scopes, red dots, rangefinders, binoculars, spotting scopes, tripods and monoculars.
UNLIMITED LIFETIME WARRANTY
FULLY TRANSFERABLE
NO RECEIPT NEEDED
https://vortexoptics.com/vip-warranty Considering I've been buying Nikon equipment for over 45 years and never needed a warranty repair, I can't speak to current problems. However in reviewing the legaleze, Vortex is clearly ahead in the commitment to the consumer department.
As for closing the sporting optics division, I can see why Nikon closed. So much competition these days and so many scopes that don't just rival Nikon quality, but may surpass it at price points Nikon won't meet. I'm sure the profit margins dropped well below what the Camera division was making. When you charge $3000 for a Z 7II without a lens, the profit margins seem to be a bit more than in the $300 scope business. Could never find a Nikon scope that fit my needs, so never bought one.
Warranties are only as good as the company behind them, and if Vortex went out of business, the warranty would be worthless. Same for Hawke or any other company. So, choose the company as much as the scope if you really care about the warranty.