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Cannot agree with you more. I personally hate chained expressions. Awful for debugging too.

Java debugging tools are beyond excellent for debugging such code (not that it should be written that way)

I still have to select the sub-expression whose value I wish to inspect. This involves precisely aiming the cursor at text, which is a lot of mental burden (x millions).

A task I thank the developer who creates a variable to hold such a reference, for it creates a much better experience.

It's only awful for debugging because the tools are awful.

The tools for Java are greate (try C++ if you disagree).

It's the code that is the problem here.

The tools for Java are much better than those for C++. However, claiming the code is the problem is silly. I'm not going to introduce a bunch of local variables just to appease a debugger.

If splitting on separate lines makes code more readable, then sure, do that. But often it just makes the code longer and harder to follow.

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