Originally Posted by
Metaluna
It's mostly because I don't have any 11-speed compatible wheels right now. Aside from the expense, as a clyde I'm concerned that the 11 speed hubs seem to be squeezing the drive side flange inboard to make room for the cassette, which increases spoke tension imbalance and reduces lateral stiffness. It just doesn't seem like much of an upgrade.
Many 11-speed mountain cassettes fit on 10-speed hubs. The largest dinner plate cog over-hangs the hub flange. Since you're already considering running a mountain rear derailluer, you probably won't mind the range anyway.