[laserlight]

Not that it impacts your argument significantly, but for the sake of completeness, Apple employs a huge number of retail employees.

[AlexandrB]

Yes. A more useful number would be how many employees are working on macOS specifically. Hard to find a definitive number for that.

[saagarjha]

Less than 1% of that number. Of course this is hard to actually count properly since there is a lot of shared work across platforms.