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B-tree index balance?

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On an RDMS which I used in the 1990s and 2000s, b-tree indices of sequences would get unbalanced, since every new leaf was added to the far right corner of the tree.
Sure, they would auto-balance to a degree during node splits, but all those "far-right corner" inserts still left them pretty lopsided.
Thus, they provided a utility which we could use to determine the lopsidedness, and thus decide when to rebuild an index.

Does Postgresql keep b-tree indexes on sequences fully balanced?  If not, how do I see how unbalanced they are?  (Assume PG12+.)

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