It's easier to remember?

Because you've seen it repeatedly over years and years of time

Meanwhile the quick brown fox has been stuck in my head for years after only hearing of it a couple of times at most.

Either you never had to take typing, never had to change your font, or just weren't very observant. I've seen that phrase hundreds of times over the decades. Hell, I remember having to type the stupid phrase repeatedly in typing class back in the day.

'Sphinx of black quartz, judge my vow' is much cooler and more memorable, just from one read.