Here’s the thing, in most sports that I can think of, when a new technique is developed, they don’t create a completely new event.
Back in the early days of track & field, shot putters pretty much just stood in the circle and put it into the throwing sector. Then they developed the Hop Step which is pretty much as it sounds. In the early 1950s, Parry O’Brien developed the Glide technique. In the early 1970s, the Soviets popularized the Spin technique. While there are still some Gliders on the international circuit, most of the top throwers use the Spin. You can use whatever technique you choose as long as it complies with the rules, but there is only one shot put event.
Same thing with the high jump. Techniques have changed dramatically, but there is still only one high jump event.
In swimming, the front crawl/freestyle and even the breaststroke have a long history. The butterfly developed out of modifying the breaststroke as it was a faster technique For some reason they eventually decided to create a new event out of it. The backstroke, much like race walking, is a fine fitness endeavor, but should not be a competitive racing event.
If logic were to prevail, competitive swimming would at least cut down to freestyle and butterfly.
I am also open to discussing the need for both the long jump and triple jump