I got the MK XI MACO space set in about a week, just from random drops. I figured it would take me 120 STFs to get the ground set (assuming 1 EDC per STF). I had 30 when S7 dropped, and that turned into 1500 Omega Marks. Under the old system, I should have needed 90 more STFs to get the rest of the Mark XI ground set.
It took 10.
Apparently my definition of "grind" post-S7 is different from other people.