I think one problem is that configuration needs start out simple and evolve to complex - as opposed to being obvious from the start you'll need dozens of discrete components to deploy. At that early stage, anything beyond a few lines of YAML seems like definite overkill.

Eventually, it becomes clear that it's very hard to maintain, but by then there's thousands of lines of hard-knocks battle-tested, working production config to try and basically recreate from scratch, without breaking anything.

Until you've gone through this process once (or maybe a couple times..) it's hard to see why you should make that initial leap to a much more complex, tools-required workflow. "But eventually, we will probably need..." is a tough sell against someone arguing to do the simplest thing.