alt Hacker Newsosu (the rhythm game) also recently switched to SDL3, from SDL2, and it came with significant performance/latency improvements. SDL3 adoption is a bit slow it seems. Though, I'm surprised Minecraft used GLFW all this time.
One notable thing is that switching to SDL3 eliminated lag from having Discord client open while playing osu. Pretty sure this was from their devlog on YouTube.
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osu! has spent a lot of time trying to switch from SDL2 to SDL3, but due to their high platform coverage (all three major desktop OSes + iOS and Android) and an attempt to keep all functionality native (so properly working Wayland supporr, along with other things) delayed the switch by around 2 years total. For the first time, the current switch seems actually final
SDL3 changed several APIs, which doesn't help, especially if using it from binding libraries.
On Linux, often times you will be using SDL3 regardless, as sdl2-compat and sdl12-compat are the default implementations of SDL2 and 1.2 on some distros. This has a lot of benefits, from more apps working natively on Wayland (which gives lower latency than XWayland) to better controller support. Not sure what this meant for osu but I wouldn't be surprised if it made the actual switch less impactful for some users.
I was, however, somewhat surprised to learn Ubuntu 24.04 didn't even ship SDL3 to begin with. Turns out SDL3 is newer than I remember. This is likely part of the explanation why SDL3 adoption is lower than expected.