I had the game and the manual, but I can’t recall if I ever read the manual. I played the game a ton and was maybe 50/50 at the landings, but just followed the on-screen instructions. I could probably have puzzled out the target numbers, but never did (was it in the manual?). Now you can just google the correct values and nail it every time (paying no attention to the on-screen directions).
[edit] incidentally, my “it’s not actually hard” thing from the NES is the dam level in TMNT. It’s a challenge like the first two times you play it, then never again. It’s just not that hard. I think it’s easier than tons of Mario game levels, for instance.
Interestingly, the instructions are actually all correct. If it says, "Left! Left!" for instance you will crash if you don't fix it.
I think the disconnect might be that altitude and speed somewhat feedback on each other and it takes time for your inputs to settle, so it always feels like you're chasing the instructions.
The region of reversed command -- pretty cool that such a simple NES game managed to replicate that counter-intuitive part of the flight envelope.
https://agairupdate.com/2021/10/02/the-region-of-reversed-co...
That's going too far.
Also, we're talking about the 8-bit era: 1) technical limits prevented a lot of in-game exposition that you could do now and 2) before the internet, people had fewer options for reading material. I read every manual for every NES and SNES game I ever had, multiple times. If I was into a game my options were limited to 1) play it, 2) read the manual if I couldn't play it (e.g. if I wasn't at home or not allowed to take over the TV to play).
Your statement applies today; game design back then was different, manuals were not frowned upon and often exciting to read through. They were part of the game.
Following that rule puts a hard cap on the game's depth and complexity at the design level.
It's probably why most games today are pretty shallow.
More generally, it's also why most software grew from tools into Fischer-Price toys over the past two decades.
There was a lord of the rings PC RPG I played around 1990, I believe, where many of the NPC interactions said to refer to page N, paragraph M. They didn't have the space to store all the text in the game.