I used to see a lot of software failures on old versions of Mac OS, but it hasn't been as bad in the past year. I am, however, on my third MBP in 10 months due

I used to see a lot of software failures on old versions of Mac OS, but it hasn't been as bad in the past year. I am, however, on my third MBP in 10 months due to hardware issues mostly around the keyboard/touchpad and the chassis.