Why is there no multiple inheritance?

Question

PHP

Why is there really no MI support in each language from the tags?
My assumption is that they were too lazy to handle the entire overhead.
Diamond problem is an excuse, C ++ is there and everything is OK, somehow we live.
Some problematic bugs due to deep inheritances, the problem is the incompetence of the dev.
Uncle Bob agrees with me on this.
Your opinion?
Are there any public statements from language creators?

Answer 1

Java has been designed with some of the most common and complex problems that come up with C++ in the enterprise sector. And when developing C #, Java was taken into account.

Answer 2

Java, C#, and PHP have interfaces, but C++ doesn't. And interfaces, in fact, are quite enough.