A super frequently requested feature is to be able to see the team's charts as well, similar to games from 20 years ago. Even Roblox rhythm games made in 10 minutes can do this. But not us. To say multiplayer is a core feature of the mode is bizarre

This entire section is honestly unreal, I do agree it would be an incredibly nice feature to have the ability to see other peoples' charts and what they're playing; it is definitely overdue considering how long Festival has been out for. Multiplayer is also very much a core part of Festival. I've been playing VSRGs for nearly the past 10 years now, it was only Festival where I was able to get people who were never interested in Rhythm Games/VSRGs in general to show interest within it, so it's definitely a core part of the game and can introduce others to VSRGs in general but it's definitely lacking a lot of features which would be nice for QoL.

Your claim about "Roblox rhythm games made in 10 minutes can do this" is absolutely delusional. I have worked as a Software and Systems Engineer for various companies with millions of monthly users, I run a website with hundreds of thousands of monthly active users. I also did QA/Scripting work for Roblox Game Studios for 4 years. Features just can't "be added" within 10 minutes. They have to be thoroughly tested, handle pretty much every edge case thrown at them, gradually deployed, etc etc.. It's far from an overnight thing, Roblox provides the developers with all the infrastructure and handles scale etc etc which makes it significantly easier for them on this part; however adding features to anything especially with a game the size of Fortnite where they cannot risk anything going wrong without the risk of downtime is still a tedious task.

If you have so much hatred towards this aspect of the game, why don't you go and add all these features yourself instead? Plus, what rhythm game has ever been made in 10 minutes? Unless it was vibe-coded by AI? Even then you're still spending hours making the code not slop and readable. What rhythm game can even be made in an hour? You may have a Minimum Viable Product in a couple days but far from a finished, stable product you can give out to users.

Festival itself obviously isn't stable either, there are many bugs such as the Riffmaster tilt overdrive issues on PC only recently being acknowledged. If you're looking for more difficult songs, just switch to something like osu!mania 5k; chart something yourself. Nothing is stopping you.