There is turbulence in any big directed change. Better overall new tech often creates inconveniences, performs less well, than some of the tech it replaces. Sometimes only initially, but sometimes for longer periods of time.

A net gain, but we all remember simpler things whose reliability and convenience we miss.

And some old tech retains lasting benefits in niche areas. Old school, inefficient and cheap light bulbs are ironically, not so inefficient when used where their heat is useful.

And horses fit that pattern. They are still not obsolete in many ways, tied to their intelligence. As companions. As still working and inspiring creatures.

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I suspect the history of evolution is filled with creatures getting that got wiped out by new waves, that were more generally advanced, but less advanced in a few ways.

And we have a small percentage of remarkable ancient creatures still living today, seemingly little changed.