I'm not making any judgement about whether you need the game text to spell this stuff out in order to play. I'm just saying, this stuff doesn't exist in 5th ed. Generally, people substitute procedures from older editions, or stuff they've learned online.
You absolutely are joining the dots when you do that, though. The game literally cannot be played without it.
Scene framing has never existed in any form of DnD.
You are basically saying that no version of DnD is playable.