Does the Count from ICollection <T> property still exist for backward compatibility?

Question

Previous context

To understand what I'm asking, first consider the question "Why does .Count work without parentheses?"

This question discusses why Count(property) and Count()(method) exist in classes that implement ICollection<T>. This question was satisfactorily satisfied .

But below the answer in the comment, another question was raised finoutlook:

Question

Does the property Countstill exist (in later versions of .Net for LINq technology) for backward compatibility?

Answer 1

, , , , .

Enumerable.Count() ​​, ICollection<T>, , .

, . LINQ, , - . ( , , , .)

Answer 2

(- ), , , .

, ICollection<T>, ( ).

, . , .