Since people will at large not do this because they don't read Screenrant and how this needs to cut though the massive social media noise and we're looking at millions of viewers, what is the consequences with this particular episode? Viewing issues, or is it meant to be dark but won't be?

Last time I heard this reasoning about bad TV settings was during the infamous GoT episode that was very dark.

Producers generally don't warn about TV settings preemptively as if to warn, so it makes me a bit concerned.

Stranger Things already face complaints about S5 lately, having viewing issues on the finale would be the cherry on top.