With no promise of any possible recompense, its one thing to work without pay with an ending in sight, this was a company literally bleeding its last well past dead and was miraculously resuscitated just past the last minute. The fact stands, QA is time consuming, particularly when its bug fixes and balance issues that arent fixable with a +/- 5% buff/nerf.

Implementing new structures on the otherhand is semi quick comparatively, easier to build a mountain than it is to dig a hole, resituate any applicable contents, fill the hole back in and make sure you didnt just ruin its structural integrity. Half the time code that should work dont and code that should never work does, cant find it at the moment but one poster on reddit even showed one line in a program, it had a note stating "do not delete or change this note, the line wont work without it, i have no idea why" and thats it, how do you purposefully figure anything like that out? You dont, you stumble on it by stupidity and random chance. People gotta remember, we aren't creating these languages in the normal sense of invention, we are discovering them, discovery takes more time than construction, particularly when youre digging through code that multiple hands have had interlocking parts in, sometimes its the equivalent of trying to decipher Mandarin with a dictionary for Sanskrit.