The first time I plugged this device in while being relatively new to linux I spent a lot of time figuring out why the audio wasn't working as opening a terminal and typing alsamixer, selecting the soundcard and pressing M on the output to unmute it wasn't something I had thought of. The left and right channel are also PCM 1/PCM 1 by default but they should be PCM 1/PCM 2. So after unmuting and setting the right channels there's audio at least. But after that there's the issue that it's being treated as a 5.1 system so the bass is on some other channel. There's an existing issue for that though https://bugs.freedesktop.org/show_bug.cgi?id=93163 I don't know how you handle specific devices. If they don't conform do you do special case handling? Or should that happen somewhere else?
If the mixer settings have bad defaults, that's probably something that is better fixed in alsa. http://alsa-project.org/main/index.php/Bug_Tracking We can add special handling for specific devices in pulseaudio, if someone writes configuration for them that is generally better than what our generic configuration does.
https://us.focusrite.com/usb-audio-interfaces/scarlett-18i8 18-in, 8-out USB interface is ideal for multi-instrumentalists, producers and small bands who want to record audio from a wide range of sources such as drums, guitars, keyboards and vocals
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/usb/mixer_scarlett.c you have to post output of alsa-info.sh d
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