This is not an accurate point of view at all. Story driven adventure games do not have some magical hex put upon them that makes them hard to periodically update. From an actual software development point of view from someone with actual experience in the industry, you're failing to take into account the design portion of the project. Stories, levels, etc. are all something that should be designed far in advance of their creation and so long as the people making the game are competent a story based adventure game could have regular updates that would show consistent growth and development, you act like scope is some uncontrollable monster. It's not. Something Unlimited does not have a problem with scope, it has a problem with a fantastic artist also being an incompetent programmer, writer, and designer. It's one dude who isn't qualified to do 75% of what he's doing.Although a bit disappointing, from a software development point of view, it is difficult for story-driven AVG games to be updated periodically unless the developer can effectively control the size of the content expansion.
But because of patreon's fundraising mechanics, unfair doubts about not being able to update on time could damage donor confidence.
So, wish the developers all the best.