I'm surely missing some films of today but I can't think of any. Why can I think of a number of examples from the 50's through the 00's?
In my prior post, I listed a bunch from the last few years alone besides Marvel that are fairly optimistic, upbeat, etc. Like, maybe you think none or barely any of those are great, but your original post was more about a film’s tone and focus, which is much less subjective, versus the supposed quality of a film, which is much more subjective. So I can’t really do much more for you here.
As for the FULL use of all emotions, I dunno, I really can’t claim to focus on a movie needing to capture every tone possible. I’m not saying that can’t be done well, it certainly can, but generally stories, especially for a movie’s runtime, should focus on a select choice of emotional tones rather than attempting to capture all of them (heck, even Inside Out, a movie with LITERAL emotions in it, focuses on Joy and Sadness and their effects on Riley over Anger, Disgust, and Fear). I mentioned The Big Lebowski, it’s obviously very focused on comedy, occasional an occasional somber portrayal of broken people (occasional moments with Walter make it clear he really needs to talk to a professional as he clearly is emotionally unstable at times), and even sadness with the ending with Donny (yes, there’s a funny moment with it, but it still got me and other people sad. Jeff Bridges nailed having The Dude sound completely fed up at first with Walter but then you can hear his voice crack as you realize he’s more upset over the loss they’ve experienced than with Walter’s poor decision-making).
Also, there were plenty of dark moments in Shawshank besides that. Prison rape, corrupt guards murdering inmates, people serving a sentence far longer than they reasonably should have, etc. Yes, it ultimately ends on a happy note for two characters, but they go through a lot of pain and struggle to reach that point.
Plus, if we’re bringing up Shawshank, why is The Batman (2022) nihilistic in comparison? By the end of the film, Batman is seen as a savior by the people of Gotham and is working in daylight working with the rescue teams to assist those in need. Alfred survives. Batman and Catwoman part on good terms. Thomas Wayne is revealed to be innocent. Riddler is behind bars. Penguin has ascended in power but feels unhappy at the moment due to his faith in Falcone having been betrayed. Yes, the protagonists struggle a lot to get there, but it ends generally on a more optimistic note compared to the beginning of the film, just like Shawshank. Heck, I mentioned The Long Halloween comic it was heavily inspired by, that comic, which was released in 1996-1997, ended on much more of a downer than The Batman did. The visual details being darker are there, but they don’t ultimately determine the tone of a story, you could put an episode of Seinfeld through a dark color filter or whatever one would use to do so and it would still ultimately be goofy hijinks with the same characters we’ve always known.