There is all kinds of wrong in your statement. Fun is subjective, who are you to say being 100% safe underground is fun? If being safe and having minimal challenge is fun why play 7dtd at all, I honestly posted those game suggestions as other options.
I think most of us here are alpha supporters have over thousands of hours of game time, bringing this up gives no one special credit.
Why on earth do u think ppl building underground harms me in anyway? I do it myself when I'm so overpowered and have to find new projects to do, and I dig a hole set out all my gear etc and stare at my walls, well this is great. I even welcome the creative ideas ppl have put forward about underground creatures. If u want to build underground u can, if u want to build on ground level u can, if u want to play no base nomad u can. How is this not creative and giving options to the players?
In my professional career I don't have 35 yrs of software development experience and I totally want TFP to be creative, I was very pro to TFP adding different types of zombies instead of more numbers and killing them the same way each time.