Welcome back
A really quick summary, as you said, TTG still MIA, some motivated guys worked hard in the meantime and we currently have a working DS3622xs+ loader able to replace 3617 and 3615 loaders (they are still working too)
There is still a little issue remaining with mpt3sas drivers on DS362xs+, it seems some SMART info are still missing, so SMART may not be revelant on this loader.
But some of us migrated to 7.0.1, as I did, from 3615 to 3622.
I don't remember since when you left, but @pocopico created a tinycore OS loader. It can build the loader and flash the running OS to have a ready to run loader.
It is able to generate fake serials, list needed modules, find satamap needed values, a real great tool !