Why are you so blatantly anti-XFS, Manjaro?
Today is the day I make my official announcement that I will be forking the entire Manjaro project as “Xanjaro”, where the only supported file-system is XFS. Join me, everyone, and we shall dominate the entire Linux ecosystem. 
TO WWWWWWWWWWWWAR! 
(Or I can just give Btrfs a try for the root file-system, or try again with manjaro-architect to use XFS.)
Hey, I know I waged war on you or whatever. But aside from that, is it too late to request that XFS is added to the list of file-systems for automatic partitioning? It performs beautifully on SSD, and some would argue even better than F2FS overall. Quite mature and stable, that even Red Hat uses it as their default file-system. It would fit nicely in the list: ext4, btrfs, xfs, f2fs
Sorry about the whole forking-your-entire-project and waging war stuff. 
UPDATE: Success! 
Please see the following forum thread and Calamares ticket: