I totally agree with you. I was asking the same question watching the athletes racing
fly (butterfly) style.
It is a very difficult movement, a beautiful one perhaps (reminds of dolphins right),
but if you ever tried it, it's soo energy depleting, you wouldn't last much with that swimming. Breaststroke? aside from the funny name (stroking breasts eh eh) it's called Frog because that's what it is: an awkward, slow, lame movement..why? When frees style is faster and more efficient?
Forget about backstroke, you will bang your head eventually....
I think I appreciate pure sports that have had utility in the humanity history by using their bodies only: running (any length), jumping, swimming (free style), gymnastics, those all served purposes of chasing, running away, saving yourself, fighting (ninja style gymnastic :) All the others are games, or movements developed just for having more games, competitions.
At the end those are the sports or styles people like and value the most. Everybody knows who's the fastest swimmer (in free style ) and the fastest runner (in 100, 200, maybe 400 meters)
or the best gymnast teams. Few know or care for the Polo winners or Ping Pong ..even the sword or tennis no matter how popular they can be, (and even worse rifle shooting...is that a sport?)
people admire the most those who use their wonderful body muscles and coordination only (no other balls, weapons, boats etc)
in the most efficient way possible (again, back to Pheps, Bolt, the USA female gymnastics or the Russian Mustafina)