I don't think shortage means what they think it means. Just because you can't find people at the price and working conditions you're willing to offer doesn't mean there's a shortage. It might just mean that you're cheap.
It's ambiguous how many each one is buying because you can't tell which dividers are being purchased and which ones are actually being used as dividers.
I have a monitor that's almost like this and it's surprisingly nice. It feels like a two-monitor setup. Two actual monitors would probably have been cheaper, but I got mine from work, so it wasn't a factor.
The real advantage of having two actual monitors is being able to flip one vertically for reading code.
It's a pretty picture but oh do I hate spider webs.