I've experienced death marches occurring precisely because the team didn't chose the right abstractions up-front because, roughly, they weren't skilled enough to have done so. Though, more than skilled enough to understand it when handed to them.

If we split it into "framework writers" and "application writers" then organizing teams along these lines might improve efficiency.

I train in machine learning and other areas, and I often make a "framework/application" skill level distinction made here -- where framework just means the meta-development activity.

What the op comment appears to be saying here aligns along my experience of working & teaching pretty exactly.