Wow ... not having ever learned any technical aspects about photography, this is beyond my comprehension. I am not having a clue what you are talking about :-D
Flash types vs camera types vs modes of flash vs range available is somewhere in there.
What does the ' sign mean in the flash range is only 3-4'? (I am not a native English speaker.)
The
3-4' signifies three to four feet, that is, roughly about 900mm to 1200mm. Reason = USA, Myanmar and Liberia never caught onto this metric measure thing. Though there's more to that of course
https://worldpopulationreview.com/country-rankings/countries-that-dont-use-the-metric-system
With system cameras the usual focal plane shutters have a maximum sync shutter speed that happens when the shutter blades are fully open, that is around 1/250 sec for most modern cameras.
When needing to use faster shutter speeds like 1/1000 sec then the shutter has only a narrow slit traveling across the sensor, so the flash mode needs to be changed to emit a string of pulses, spreading the flash power available out over a longer period than usual, this limits the effective flash range and faster shutter speeds make it shrink even more.
Long ago I used a focal plane shutter at various speeds with normal flash to show how the shutter slit gets gets smaller as the speed increases....

Shutter shadow just starting to creep in at 1/320msec, really tiny slit at 1/2000 sec.
Because as the speed gets faster and the slit shrinks then the flash has to work harder to expose the ever shrinking available shutter slit properly, thus explaining the huge shrinkage of available flash range with focal plane shutters at higher shutter speeds.
I repeat the diagram from my old Nikon SB-26 flash....
Faster shutter speeds need that string of pulses instead of only one pulse for normal first and second curtain flash sync. The flash capacitor contains only so much charge so needs to spread that power out over a longer period thus part of the reason for the maximum flash range shrink.
I hope some of that explains some things for you.