The same way people think pixel art HAS to look janky and jagged as fuck because they play on emulators with an image upscaled eight times on a modern flatscreen TV, the "90s anime" look is entirely dependent on two things : your cheap CRT monitor and the cheap VCR your unemployed uncle used to record it.

There's a reason why the only people trying to recreate it that way are from south America, when you ask the japanese to draw old shit from the 90s they'll remember the DVD release and you'll very rarely see scanlines, chromatic aberration and such.