From my experience, this stuff is rarely introduced to save developers from typing in the code for their logic. Reasons I observe:
1. SaaS sales/marketing pushing their offerings on decision makers - software being a pop culture, this works pretty well. It can be hard for internal staff to push back on What Everyone Is Using (TM). Even if it makes little to no sense.
2. Outsourcing liability, maintenance, and general "having to think about it". Can be entirely valid, but often it comes from an "I don't want to think of it" kind of place.
I don't see this stuff slowing down GenAI or not. Modern software is not unlike modern cars: A potpourri of components from different vendors that may all have been tested in isolation, but a lot of errors will arise from integration.
LLMs are also not very useful for long term strategy or to come up with novel features or combinations of features. They also are not great at maintaining existing code, particularly without comprehensive test suites. They are good at coming up with tests for boiler plate code, but not really for high-level features.