Um... because the Xbox one and PS4 hadn't released when this game was first ported to consoles?
The reworking of the engine is causing delays now, but will speed updates up in the future.
Look at this:
On PC,1.3.0.1 released on June 30,2015.
1.2 released on September 30, 2013
The closest update between the two was 1.2.4 on May 15, 2014.
Just over a year to get from 1.2.4 to 1.3
On console, it took from Dec 15, 2014, the PC equivalent of 1.2.4 to Aug 26, 2016, which was the PC equivalent of 1.2.4.1 That's almost two years, double the time to took PC to get an entirely new update, not just extra features that were left out. I rest
my case.
Anyways, If you want to continue the debate, message me, it needs to stop on this thread.