Qt6 still doesn't have a lot of modules ported to it though, as it really hadn't been around that long.
since 6.2 most of the big qt5 modules are ported I believe
Yes, though qbittorrent at least has moved to it / supports it, which is how I found out about it. After an update it started with a completely different theme, and eventually I realized it had switched to Qt6 and I needed to install the Qt6 version of the theme.