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From user perspective. Gains.

Nothing required big 2/3 change. Ruby and Go done it right — a series of small changes. Python 2.* had it right. The attitude of language developers was clearly stated in PEP 414 and 2to3 approach — no backward compatibility. That is nonsense, every python program had backward compatibility several minor versions deep.

Select one issue and work on it. Unicode:

    # python prev
    u"" # or from __future__ import unicode_literals
    b""
vs

    # python next
    u""
    b"" # or from __past__ import binary_literals
Facts speak for itself, change was to big for users to overcome it, price was too high. I've lived through Ruby string changes, not a big deal.

Wayland transition is nothing like Python 2/3. It is big but mostly invisible, XWayland runs X11 applications, toolkits hide implementation details, no X.Org deprecation.




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