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As someone who's been hired by Google twice, I'm very happy that I spent 99% of my time actually programming. (I did a day or two of Leetcode before the second time, just to make sure I was appropriately calibrated. It didn't exist before the first time.)

I don’t know what interviewing at Google is like now but I interviewed for Google in 2008 (no offer) and 2012 (offer) and the questions on both occasions were not of the nature that leetcode could have helped with much.

You are right. Thank you.

On the other hand, mastery through 10 years of practice means and leads to a good knowledge of data structures and algorithms.

I don't think it necessarily leads to a of mastery of data structures and algorithms in the context of leetcode/modern coding interviews. One can do a lot of coding, and even be paid for it, for years and just not even encounter a lot of this material. Though one will have developed much of the same intuition that you typically acquire in a data structures class, it doesn't necessarily mean you're prepared to code mergesort on a whiteboard.