I 100% agree that it’s not the technically optimal solution. But don’t discount the idea that, given an existing set of people and skills, it can definitely be the local optima organizationally.
The maybe dozen NUC's I needed were not a very substantial hardware cost. You bought a Celeron NUC and they just worked even if you didn't have the most experienced staff supporting them or the best software running on them.
If you're going to be deploying a thousand such systems, sure, of course you shouldn't use NUCs.
I'd probably argue that, barring specific requirements that these might not cover, the NXP i.MX6/7/8 would probably be my default for something like this in volume. ~Motorola~/~Freescale~/NXP have been incredibly great stewards of the platform and provide significant lifetime guarantees for their parts (like 10+ years often). Plus you can generally run mainline kernels on them unless you're doing something special that requires something from their vendor branch.
For one of them we had to switch from a Raspberry Pi to a small NUC to display a page with 3-6 videos running. The pi could show 1 or 2 videos but with all 6 going, it was very stuttery playback.
1. LoB apps need to be run not just on a computer that only shows a screen, but in other contexts, there is no reason to develop a whole new app just for that purpose.
2. Developers who are only used to working with Win API's like WPF, DotNet, etc. or other frameworks that are windows only Why would we want to employ whole new dev team just to maintain that app separate from the apps that run on our Laptops and normal computers
3. Management Tools. If my entire fleet of computers is managed by ConfigMgr and controlled by Group Policy and Compliance Setting why would I want to spin up a completely separate management system like Ansible or something just to control these machines when I could have them integrated into my existing tool set of which my helpdesk and everyone else is trained to use?
I can probably come up with 5 or 10 more reasons
The Intel NUC Celeron systems could not be met for price if you also needed Windows. To beat the NUC Celeron on price you had to drop to ARM and use Linux but if the software you needed to run only supported Windows that was not an option.
the Celeron NUC's where GREAT for Line of Business use cases where the computer was running a Screen, or Single windows Application