If they wanted to cut corners it would have been far less work to take D&D 5e rules and implement them instead of reworking the basics of the action economy and thus forcing themselves to rebalance all classes through all levels to make up for it.

When it comes to gameplay they have tweaked pretty much nothing except for reducing surfaces and fixing some minor bugs. That's not even close to what would be necessary to give the combat system some resemblance of balance after they 'cut corners' by implementing their vision.

Anmations, character customisation, UI... yeah these are WIP and pretty much everybody here knows that those are being finished as times goes on. I don't even see there any complains from people on this board (except for the aweful party controls).