It absolutely
was Steve Jobs's fault, although we're talking about the pre-NeXT Steve Jobs the Grey rather than the revenant Steve Jobs the White.
Around the time Walter was working on Datalight C, I was working at a computer game company in Austin that most geeks over the age of about 35 have heard of. All decisions of note at this well-regarded company were made by a figure of equal repute, someone with the tech chops of one Steve and the charisma of the other. This guy wasn't a Mac user himself, but there were a few Macs in use around the office, and he fell for the WIMP paradigm hard.
The games in the series he was known for were historically keyboard-driven, but the one we were working on at the time, the sixth, was the first to be developed on the PC rather than the Apple II and also the first to feature a GUI. So everything was icon-based whether it needed to be or not, because "that's how the Mac does it." Hieroglyphics were hot again, who could've seen it coming? Don't complain, just work like an Egyptian.
At the time this flavor of Kool-Aid was being consumed all over the place, from game companies to office/productivity software companies, and it unquestionably all went back to Jobs, or more accurately the cues Jobs took from PARC. We weren't alone in being ordered by management to Think Different(tm) by ripping off some guys in Cupertino.