This was already discussed a few months back in the forum and one question that arises is ofc: Do have to do it on every class again? Or can I finish SSS on my well geared paladin and slip in as dragoon (a class I have NO idea how to play, hit buttons, I guess?)?

I am not so sure about mandatory because that seems way to complex to introduce (and also only really works for dps - tank and healers... not so much).

However I would really like it if they kept pushing people to do it a bit more - right now, you do one quest and then... it disappears of the radar. Some sort of "warning" or encouragment would be nice - you unlock a new trial and the game offers a free teleport to try SSS first aswell as a note in DF telling you that you can try this thing in SSS to get better.