5K is a price outlier. LG Display are the only panel manufacturer, and they appeared in very few retail products. It just didn't become an industry standard size (8K has a better chance).
You can buy a 4K screen with the same pixel density for under 300USD, from a well-known brand.
You can buy four of those for less than that single 5K display. So I would suggest dual 4K.
There is a difference between not “needing” expensive hardware and saying the hardware is overpriced compared to the competition.
If you haven’t noticed, Apple doesn’t sell low end products. You’re not going to find a Mac with an “Intel® Pentium® Gold Processor G5400” with 4GB OF RAM for $349.
