I have never seen team who only does architecture and no implementation ever succeed. You usually end up with lot of UML diagrams and PPTs that are unfortunatel

I have never seen team who only does architecture and no implementation ever succeed. You usually end up with lot of UML diagrams and PPTs that are unfortunately not executable. When "implementors" arrive at the scene, they realize all the things that had been overlooked from 30,000ft. Finally what gets implemented is either good with little resemblance to those pesky UML or terrible but in full compliance of "architecture". Avoid pure architecture teams at all cost.