DND writes its rules to be as quick to read and apply to basic situations, but then becomes unwieldy in many if the non-standard cases because they didn't take the word count to fine tune the rules work as you necessarily would expect, and thus they become confusing.

Something like PF2E (while not perfect in clarity, but much better) has much more verbose rules, but they do a better job of making them apply to non-standard situations closer to how you expect more often.