Probably because they used their gut feeling/intuition which stems from experience, so they started suggesting arguments to support their gut feeling. Their gut

Probably because they used their gut feeling/intuition which stems from experience, so they started suggesting arguments to support their gut feeling. Their gut feeling may be correct, it's just that they might not be able to see all the arguments or edge cases that may make this indexing a bad idea so they are concerned about implementing out of the box. It's very typical when suggesting ideas that go against the usual best practices, status quo, but it's understandable since you actually should consider all the edge cases before moving away from known ways of doing things.