While those things are true, it's still a different animal. Yes, Apple's hardware+OS combo is a walled garden. However, while you can't easily modify that hardware, you can connect it to any brand of SD card or monitor or hard drive or keyboard or mouse or trackpad or whatever. You don't have to buy Apple-branded memory cards or other accessories. With Sony, you had no option.

I'm not arguing against what you're saying, but I think it's orthogonal.