If I remember correctly from my British Cinema class, filmmakers had a phase during the advent of household televisions where they were trying to differentiate themselves from live TV. To this end, they used aspect ratio. TV was in 4:3 while films were in 1:85:1, thus giving them a grander feel (this also meant that films like The Innocents had to get creative if they wanted to emulate other aspect ratios).
Some cinematographers these days use 2.40:1 for a larger, wider image overall (if you’ve seen Bollywood films, this is their aspect ratio), 1.43:1 is used for films shot on IMAX cameras, and 1.85:1 remains the classic cinematic thing. As such, films change their aspect ratio either to fit screens better or as a tool to make something look more cinematic (for example, Everything Everywhere All At Once reduces the aspect ratio during inter-universe chicanery, and Lightyear increases it whenever they do a hyperspace jump).
Does that answer your question?