Counter to that I’ve seen a £37m contract for a form on gov uk with absolutely no change in process, just going from a letter received to a online form
GDS is amazing. However, unless we double/triple the GDS salary grades, it'll inevitably be hollowed out. From what I heard, that might've already happened.
Look for yourself, GDS is hiring a "Lead Technical Architect" for £67,126–£91,453 https://gds.blog.gov.uk/jobs/ . FAANG (and Palantir) pays up to triple that. How can GDS compete for talent?
But how many people can you attract, and how quickly can they get the stuff done? There are a lot of sacrifices you have to make working for the gov that not everyone will make.