I jumped to Sequoia on my 2019 Intel MBP earlier this year. I don't think anything was fixed relative to Music, Mail, and Photos. They did add the categories feature to Mail and I don't remember if they deprecated some Mail plugins in Sonoma or Sequoia. At any rate, feels mostly the same for me. But I'm on Intel and don't get the advantage of the couple Apple Intelligence features that come with Sequoia. If you're on Apple Silicon and that interests you, Sequoia may be worth the upgrade. It's been stable for me. I mainly upgraded from Sonoma to Sequoia for the Password application and iPhone Mirroring and, I know this might seem insignificant, but I like having the Low Power mode toggle available in the Menu Bar Battery icon. In Sonoma I have to go into System Settings and Battery to toggle Low Power, but it's conveniently in the Battery icon for Sequoia. And finally, I'm going to ride out the final two years of support on my Intel MBP with Sequoia before buying into the Apple Silicon family in 2027.