It’s mostly rated TV-PG. The equivalent in TV you a ‘G’ trying is TV-G or TV-Y.

That’s objectively not true. Studios could choose to have a movie rated or not. Many are just “un-rated”.

Many were rated as G because post-Hayes Code but pre-MPAA ratings, most would have earned a G anyway

For a G-rated movie? Imagine watching that as a 5 year old.

But it’s not just that scene. In general, the movie is fairly dark, the story is fairly complicated, and it’s very slowly paced.

I’d still put it in the list of ‘mature’ even if I’m not arguing it should be rated R or anything. It is obviously rated G after all

Star Trek the Motion Picture pretty gnarly transporter death with screaming, very slow ‘think piece’ pace and subject matter

2001 A Space Odyssey Mind bending, bizarre, slow. Mature subject matter and homicidal computers

Willy Wonka and the Chocolate Factory (1971) Acid trip of a movie with some bizarre things that have to have killed some kids

It is.