I'm hoping at some point before I die but still young enough and able to move my hands to play the game. If he's working on different things it means that he's adding new stuff to the game which in my book is a plus.When will the dev resume working on the main story after timeskip
From a project point of of view it's better to leave the main story until the end, that way you can end the story based on what you already have in the game and the stuff that the player has experienced.
I do admit that his updates seem all over the place sometimes since I've almost never seen an update related to the previous one but I guess that's his style, Ryen's updates are like a box of chocolates, you never know what you're gonna get.