That is nice for some users but again I feel like software including installation should be as easy as possible. We have actually lived in that era where we had to read documentation, install by compiling, and configure with dotfiles. I have had enough of it. I am happy with the basic functionality - read/fill form/annotate - that Okular provides in a dead simple interface and it comes with all format support pre-installed on all distributions that I have used. That's a win-win.