"At any given time though, my design group is working on roughly a dozen or more projects of nontrivial size, while simultaneously watching for urgent problems

"At any given time though, my design group is working on roughly a dozen or more projects of nontrivial size, while simultaneously watching for urgent problems cropping up across a site of significant volume and breadth. That keeps us very busy. So as a matter of resources — having enough designers to take care of everything — it's almost impossible for us to implement every change or improvement we'd like to see happen." sounds like they need to hire 5-10 more people who just focus on new things.