That said, using a Blu-Ray UHD player, or any other source with 4K content, you can project crystal-clear documentaries and other educational material. Now, for content that does not go through a UHD player, such as engineering drawings, renderings, presentations, etc., you will be limited by your computer's maximum output resolution. For instance, if you’ve got a laptop that has a maximum output of 1920 x 1080, being able to work with higher resolution files doesn't mean you can output them.
This is where a 4K monitor comes into play. You’ll want to get one if you’re looking to get the most out of this projector. There are several industries where high resolution is important, such as in universities, engineering, science and architecture, or anywhere where there’s “modeling” or "rendering", etc. Projecting content at 1080p will still look rather excellent, and it will be enhanced by the projector's processing and pixel shifting, but since you’re springing for the 4K capabilities of the Casio XJ-L8300HN, you might as well go all out.
I'd like to mention here that while the Casio has 4K UHD resolution, it does not support HDR (High Dynamic Range). HDR gives more pop and wow to the color, and is seen most often on home theater projectors that are 4K UHD or true 4K resolution. It's not necessary for business/education/commercial applications, but I still like to see it when the projector is 4K capable. That's not even a minor strike against the L8300HN, just something to be aware of.