I find that clear and simple writing correlates with high quality work on the technical level. Especially at the top of the respective field.

For example in AI if you read the papers coming from the best labs the writing tends to be on the point, short sentences, almost informal-sounding, actually someone telling you what and why they did and what they found. Not merely conforming to arbitrary rules set up by bitter mediocre "scholars".

But yes, people who are afraid they have nothing to say try to hide it behind long sentences with incomprehensible nested structures and overjargonized vocabulary. Plus equations that are designed to impress rather than enlighten.