The bigger the game, the longer it to develop/update because of multiple path/choices you made. You can have small updates with 1/2 scenes every month or 2 month. Or you can have normal size update, with story progression and many scenes. And he is working alone. But the amount of work is getting bigger with every update. It is not an conveyor where every part is the same every time. I think people forgetting about it.
The main effort in terms of the overall amount of time spent making these games is in composing and rendering the images and animations.
What effect does multiple paths/choices have on the amount of time it takes to compose and render an image?
None. The amount of time required is exactly the same, whether the game has one path, or many.
The number of images the guy should be able to produce, in a month, two months, whatever, is the same, no matter how many paths there are.
I think it's fair to asume that the dev's hardware is at least as good as when he first started to develop the game.
Maybe he's improved it, since then, or maybe not. I'm not privvy to that fact.
But, at the beginning, he was capable of putting out, what was it?
450-500+ renders per month/per update? Something like that?
So why is he incapable of putting out that level of content now?
Mmm...I'll take a wild stab in the dark , here and one word comes to mind...
Motivation.