6
What is the square bracket just under the pivot next to the rear shock for??
(files.catbox.moe)
It’s to attach a direct mount front derailleur if you want to run a 2x or 3x setup.
I can't say for sure, but likely a front derailleur mount or for a drop cage. That looks like the right height for a traditional double and smaller cassette. The frame probably comes in a lower spec variant with cheaper group sets or was planned at earlier stages of production design.
Front derailleur mount.
It's better when it's dirty