

That’s not exactly what happened. The Lower Decks episode just told us that there is another universe where the Klingons look like that. That doesn’t mean they never looked like that in our universe. One of the other things the Klingons turn into is an Ancient Klingon Sailing Barge. I took it to mean technology and culture had progressed differently in those universes.
I disagree with you, but for the same reasons? I felt like season 3, when they’re first getting into the future, exploring, and meeting the people there, was the most like Star Trek. I also think the Mycelial drive is a good fit for the future setting