The fact of the matter is that FBSD rejects this notion because the community thinks that it's command line installer is good enough. Decades ago, it WAS good enough. Today, it's crap. It's been crap for a very long time. Graphical installers have been created, but FBSD couldn't be bothered to use them. PC-BSD had one. GhostBSD has one.This is an interesting question because there are no such 'guys' who can answer this. Many people have done a great job developing different parts of this Operating System, but obviously they have no resources and maybe even skills to work on (yet)another Window Manager. Different WM communities have also done a great job, but they are not directly linked to the FreeBSD project.
Personally I think that it is better to have good building blocks (read OS, WM, browser, etc.), rather than everything glued together and forced on user (like in Windows). I think this is the weakest and most annoying point in Windows that OS is inseparable of User Interface. I like the freedom that I can select the UI I like, but not to be married with it.