In the classic FDE model palantir pioneered, one of the main features was that you would use your learnings from one customer and integrate that back into your in house product, so that similar customers are serviced for cheaper later on.

With AI coding agents FDEs are now everywhere. One because they can demand a higher salary due to simply doing more due to AI. And two, because AI really accelerates the whole bespoke solution implementation thing. However, from what I hear, none of the actual "integrate that back into your in house platform" stuff is actually happening. So it's a tiny bit of a farce.