What's the demographic of the people running these startups? People who have grown up in the Web 2.0 age that think they know better than older folk that have already run into these situations and come up with means to mitigate them. Because it's "old" it's bad and has to be thrown away and discarded.
Having worked with some of these people first hand, my level of contempt for these webscale "developers" knows no bounds. It's like working with 15 year olds who think they know how the world works and complain bitterly that their parents are holding them back. Their a testament to Dunning and Kruger.
I've been pushing back at our company against using all these saas because this sort of situation is just going to keep happening, and undoubtedly escalate, all because webscale developers arrogantly dismiss the lessons of the past.
(eg: I actually had someone tell me that they refused to use port 80 because it was "against modern development practises". I'm pretty sure I physically felt several brain cells shrivel up and die when I heard that. They also refuse to use version control and branching because merges are "too problematic".)