A DESCRIPTION OF THE PROBLEM :
As a student/new learner/experienced programmer etc., I have to use some common code to create Thread and start it from Runnable functional interface lambda implementation.

Eg: Runnable test = () -> System.out.println("My Runnable Task");
Thread t1 = new Thread(test);
t1.start();

Could we create default method and its overloaded versions in Runnable interface to move above mentioned last two lines of code to Runnable interface?

Eg: default Thread startThread() {
        Thread t = new Thread(this);
        t.start();
        return t;
    }

Then I can create a single/multiple threads using startThread() function on Runnable interface lambda object directly.

It could be a better option to merge Runnable and Thread APIs into one FunctionalInterface creating simplicity for new developers.

I am happy to discuss further on it and can contribute to openjdk if required once approved.