The definition of luxury has changed. It's now more about value, utility, and stability. Luxury means owning property in a high-end location, a MacBook Pro, fast optical networks, clean drinking water, and a reliable car.
do you really think that people buying Saint Laurent jeans last year are now worried about "fast optical networks, clean drinking water, and a reliable car"?
I like my comfortable cotton tank top and my mom's mac and cheese but neither of them are luxury goods.
In fact since a lot of luxury is actually about signaling, if it's too comfortable / has high utility, it might actually lose status.