Apple’s revenues are a crappy statistic because the majority of their revenue and profit both come from consumer-level content consumption devices. For all the talk of “Microsoft Office on your iPhone” there is still nothing to supplant the hidden iceberg of small-to-Medium-to-Enterprise businesses that are only able to function because of hacked-together VBA macros in an Excel spreadsheet stored on a Synology box somewhere.
PC software matters because it’s still the only platform that enables scrappy non-expert _go-getters_ to get things done. Despite the announcement of “real” Photoshop for iPad - Hello? Binary 8bf plugins? Where are you?), Apple’s continued devotion to the Walled Garden concept and associated prohibition on extensible iOS applications - combined with the high barrier-to-entry to develop for Apple’s ecosystem means that the PC will always be relevant.
As an aside, it’s kinda funny that VBA macros copypasta’d together by individuals with little to no formal SE or CS training provide more utility-per-MB-of-RAM-consumed than Electron apps.