I agree with your statement in general.
The challenge posed by poorly worded Stealth rules, in particular, (as
@James Gasik pointed out in post 531) is that the RAI could realistically be one of two things: stealth is an easy-to-use, ninja-like Elder Scrolls "stealth mode" tactic; or stealth is a difficult-to-use "cower in the dark and hope no one sees you" tactic.
Ultimately, the DM decides which of those two paradigms applies at their table. But to me, ninja-stealth-mode D&D and cower-in-the-dark D&D don't even feel like the same game. The combat tactics they each support are so different from one another, I find it hard to identify a single, baseline 2024 ruleset.