Since Devs are talking about what to do with marks, they should keep them in game and convert them into the same way used in 11. Let us buy Job-specific gear, use to buy scrolls to increase exp just like the GC ones, and so on. Once housing comes out can add in stuff for house. To earn marks make the guild task board item give marks over gil. Sadly though most of us all have 100ks worth of marks so SE would need to find a fair amount to take off each guild so players don’t just buy everything from get go.

Also for battle guild marks. had boards there that daily tell you to kill cretin mobs for marks. Marks from combat jobs could be used for housing items, maybe for foods/useable items that enhances some skills, job relayed emotes, and stuff along the lines of that.