From the opinion piece:
Last year, I pointed out how many big publishers came crawlin’ back to Steam after trying their own things: EA, Activision, Microsoft. This year, for the first time ever, two Blizzard games released on Steam: Overwatch and Diablo 4.
Putting a product out requires 1% inspiration, 99% perspiration. The reason so many people make hour long video essays is that they can regurgitate their inspiration directly to a camera while doing little substantive work.
Valve likely has other “1% inspiration” tasks people often choose over the “boring” parts of game development - the bits that don’t excite anyone, and would only be done with the direct promise of a paycheck. Who wants to write up a design document, and go through 8 drafts for feedback?