I do see this kind of behavior in engineering oriented fields. Maybe the authors try to be as formal as possible, but doesn't known when to stop? Or maybe this is how they naturally think? (I doubt this, but because this is so common, I wonder if this is actually the case...)

I had a similar problem in my earlier career, because I try to be as precise as possible. But for conciseness, I don't bother to explain anything. Later on I learned to say things in English, or give intuition, before writing out the formal definitions.

Fortunately, papers the reviewers cannot understand have a hard time getting into top conferences in my area (CS theory).