imo boost is still in its early stages,and its not that technology has gone to far but not far enough yet.
when we set a car up for a track it is usually a compromise.
if we ran square race tracks all we would need to setup for is 4 left or right hand corners and 4 straights.
this would make it very easy as all four corners are the same.
fortunately we don't run square race tracks,but tracks with multiple different corners. its impossible to set up a car to be perfect for every corner.
if its set perfect to get the most out of tight 180 corners it wont be perfect for big sweepers,so we need to compromise to an extent so it can driven well on all corners.
this applies to motor/esc settings as well. not so long ago we didn't have much choice but gearing,now we have they advantage not only of dynamic timing but they ability to adjust it to suit our needs.
imo this is were technology is behind or more correctly most of us have not caught up.
if we data logged our running on the track with a overlay of were the car is on the track we would get a much better picture on how to best set the esc boost/timing
we would then know exactly what rpm were doing at every corner and each straight,it would still be a compromise to some extent with multiple corners but give us a much better understanding of what rpm boost needs to start
how much we need etc.
for those having a hard time working out boost its not you don't know enough to adjust it to its optimum,you just don't have enough information to yet