I'd be careful and try to recognise that the concentration of Apple-focussed development environments that you observe in the SF Bay area is not a reasonable re

I'd be careful and try to recognise that the concentration of Apple-focussed development environments that you observe in the SF Bay area is not a reasonable reflection of the developer community at large. Windows still holds the greater proportion of market share by a large margin. On that note, you should make a point of also asking why Apple needs its own browser, or why Google needed to diverge Chrome from Webkit, or why Opera needs to exist, and so forth. Competition is good and mitigates complacency.