Let me take a couple of guesses.
First off, in the early days I doubt anybody wanting to use a computer for music production would have been very happy using MS/DOS text commands. Apple stole an early lead with their point and click operating system. Even when Microsoft released their early versions of Windows, it wasn't very good at multitasking etc.
Second, Protools (which became the de facto standard) only ran on Apple machines until sometime in the early 2000s.
The pessimist sees the glass as half empty. The optimist sees it as half full. The realist just drains the darn thing and gets a refill!