A lot of people already own headphones that are usually more comfortable / sound better than the standard Apple earbuds.

I suppose it's not "can't", but "won't."

It's a one-device investment, you can't even use them on macbooks without a dongle converting it to 3.5mm jack let alone people who have 2 phones and the other being an Android, can't use the headphones on Android tabs or laptops. No point getting locked in.

I rather not listen to music at all, but to do it with Apple's headphones. Never been a fan of those.