By hard being hard i didnt mean putting deathstream into the part that obviously shouldnt be any kind of stream. Since you already picked image material...I think that if you picked ar8/9 for slow part before kiai most of players would be thrown of by sudden change of ar even if warned previously and thus very bad.I frequently switch between AR4.5 and AR9.66 in consecutive maps I play and it requires no adjustment period at all. It's not difficult to get used to and putting the two approach rates in the same map doesn't add much difficulty to the process if it can only be changed during a break and is properly indicated in some way.
It's interesting to me that you've done some sort of almost 180 here. You were saying before that easy things in hard maps should be made difficult by use of high AR (which, by the way, is completely nonsensical, since anyone who can play the hard parts of the map well will have no issue at all reading the higher AR on the easy part). Now you're saying that we shouldn't add difficulty to maps by changing the AR (which is also pretty nonsensical, since it'll just require a little bit of getting used to). Like...those two things don't directly contradict each other, but I really don't understand what your opinion on approach rate is. Should it be used for difficulty? Should it not be used for difficulty? Should it be whatever the mapper wants to use? None of those answers make this request bad at all, but it looks like you're just jumping around between them to try to find one that supports your side of this.