I've just updated my usb disc setup wit the latest stuff and can confirm that it seems to fix the limited memory issue for me. I had lot of trouble getting it to boot though and it seems like maybe once in three tries it will work. It took fiddling and many tries to get it to boot and then connect via xrdp.
It's not a weak PSU either; I have a 60W Anker usb supply with nice heavy conductor 12" usb cables, and the disc (actually both of the ones I tried) are self-powered anyway.
So I'd say we are doing much better but could do more.
For people wanting to make a nice desktop setup with SSD etc this might be good time to look at http://www.suptronics.com/miniPCkits/x3000.html
- seems like a nice power management board, SATA interface etc so you can stick in an mSATA SSD card, a built in fan for those warm Pi3's, and an SPDIF audio out. I've had several of their add-ons for a year or more now and they do their job well.