Of course not. These are not disposable consumer models, but business models built to be in one piece for at least one corporate refresh cycle, the warranty of which starts at three years instead of one year for consumer models. If you want to buy these new, you'd order them directly on the OEM's website.
After the "unboxing the new toy"* rush ends, believe me, new vs. used becomes very irrelevant.
I'd gladly take {$500,$1000} off the retail price of a {one-,two-}year-old $2000 mobile workstation in exchange for a year in processor tech (which has really stagnated between 2013's Ivybridge and 2017's Kabylake, only showing meaningful progress in 2018, before stagnating again in 2019). Heck, one year old models have two years left in the warranty (assuming quality business-grade stuff), so you should be as safe as if you bought it new. (Used laptops have the risk of previous owner damage or shipping damage, new laptops have the risk of factory or shipping damage, so it's all the same, you're simply swapping in one risk for another.)
Linux support is better for older hardware, where the devs had taken enough time to code and fix their drivers.
Personally, whether I've bought laptop X for $1600 new or $160 used after two years, I'm ending up with the same laptop in either case. Except that in the first case, I would have wasted $1440 for a temporary "new toy feeling". This is especially true in your case (as you explained in the post above). You simply wanted a 17.3" panel to view two documents at once, which suggests that you aren't doing anything that requires a really beefy setup (where one is better off with a desktop anyhow). A $250 ZBook from 2015 would do just fine for that.
But to each his own, I guess.
* The "new toy feeling" can also come from a used gadget as well. In my case, at least.
Biting the hand that feeds IT
