If LLMs can't deal with those legacy file formats, I don't trust them to be able to deal with anything. The idea that LLMs are so sophisticated that we have a need to dumb down inputs in order to interact with them is self-contradictory.
While I agree, the parent also talks about efficiency. If a different format increases efficiency, that could be reason enough to switch to it, even if understanding doesn’t improve and already was good before.
Thank you, yes, efficiency was entirely my point. :)
Humans are far more efficient when they interact with information that's in a format that suits their abilities or preferences; it seems pretty obvious that in some ways the same would likely be true for LLMs.