Chris Roberts said SQ42 and SC would be finished within those first 5 years, he never once said it would take 5 years before development would begin. He actually said development had already started, just like he said he had played through SQ42 completely and it was months away from release... in 2016.Yes it should be but the first 5 years cig where building the studio and creating poc stuff for sc.
Once they build something they realise they needed to redo the game engine and build new core techs.
I've read that thread and it's outdated because over the past 6 to 8 months they have addressed many tech debt bugs
Tyrer the lead game feature team said they are going to only add stuff in sc that's more complete and serves a purpose rather than just bringing it in for the sake of it.
3.15 comes with a ton of features BTW. There biggest update probably since 3.0
But expect lots of bugs to be introduced and some outstanding ones fixed (it's coming with icach)