[Tiktaalik]

It's not standardized or if it arguably is, only in the last couple of years since Unreal and Unity took over, and even then, many will say that Unreal is only really saving you heaps of time if you're making a FPS/3rd person game and if you're doing anything else you're swimming against the current.

Then of course every few years the platforms change and that throws a wrench in the works.

Things take so long because so often everything is built from scratch and got to the point where it just barely works for ship, and then ship happens, everyone moves on (teams break up!), and the bespoke tech hyper narrowly optimized for the specific game is unusable for anything else.