It is a double-edged sword. I believe the primary reason Windows has so many 'issues' in general is the sheer amount of hardware and ancient software that is su

It is a double-edged sword. I believe the primary reason Windows has so many 'issues' in general is the sheer amount of hardware and ancient software that is supported. Keeping the surface area small is easier to maintain, more secure (less attack vectors), etc... I am not saying one approach is better than the other - but when it comes to Apple it makes a lot of sense that they did what the did considering they have full control over their entire stack top to bottom. That being said, they did extend Carbon compat for a really really long time. AFAIK Photoshop was still Carbon for a long time after the switch to x86.