You do realise, that FH, which is supposedly extremely simple, has taken 2 years longer than SLS will to get to its first flight. A delay of 2012 (Or even 2010, as originally stated on their website), to 2018, is 6 (or 8) years, while SLS has been delayed from 2017, to early 2021, which is 4 years, half the time FH took, for a far more capable, and frankly, better rocket, with the capacity to take humans once again to the Moon.
And another thing: Speed isn't a good thing if it means you cut corners, and blow up a crew capsule.
Propulsive landing of D2, Red Dragon, Grey Dragon, F9 s2 recovery, parachute recovery of F9/1 s1s, Carbon Fibre BFR, ITS, 24 hour F9 Reuse, transpiration cooling... That's not "almost EVERYTHING".
STS-41-D was successful. No one died on that mission.