That's very personal though. It's not like I'll urge you to buy a new case - if I can even do that… - but cases add a functionality to the phone: protection. That's why so many of use use a case with their smartphone. Specially if one wants it to last for years.
With that said, I totally agree with you. A device feels so much better with nothing on it. That's why I decided I would put nothing - not even a screen protector - in my MacBook. Only a carrying pouch