Why is D unpopular?

[forkit]

On Saturday, 11 June 2022 at 11:42:06 UTC, forkit wrote:
>

btw.

I'm open to being enlightended, on how a language can support all 
the features of object-oriented progamming -  including, 
encapsulation, inheritance and polymorphism - without a class 
type.

My assertion was, that a language that supports OOP, must have a 
class type.

I'm not aware of another way to provide all these features 
without a class type.

Is there another way? Did you learn something in your degree that 
I'm unaware of?