All Drupal and no WordPress makes Jack a dull developer
In each of the conferences it was striking how focused everyone was in their own specific camp. Like in a group hypnosis the system of choice was considered superior to anything else and alternatives were just targets of sneers with flaws being pointed out. Everyone was confortably living in their own bubble and patting comrades on the back.
It is understandable that conferences focus on certain systems to deepening knowledge and make connections within the communities. This is especially true if your employer or your company is all-in for example in Drupal. In my opinion it is very limiting to only follow what's going on in your camp - even if for know other reason than "knowing your enemy".
Even though I have for the past years focused on a single product, I have kept a hands-on touch to alternative tools as well. I have been able to draw quite a bit of information about this on where the market is going and how other systems do things.
I am the first to admit that I don't have the strongest routine in Drupal or WordPress development. I can not compete in with experts churning out sites day in and day out. Both Drupal and WordPress have experience very little fundamental changes during the years, so keeping tabs on the larger features and development methods is not a lot of work.
To change is difficult. Not to change is fatal.