In technical organizations (all organizations really), simplicity is also a hard sell: you need people in charge with the ability to say "no" to a lot of ideas. And no one wants to be on the receiving end of a "no".

Those who favour simplicity will always be outnumbered, and their position will be untenable unless the entire top management team agrees. Good luck with that.

It is also one the reasons why the BDFL model works so much better: you need the ability to say "no" a lot.