*Sigh*.
I skim read it, too long and not that interested.
You speak of manga facts.
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The logic behind those two scans like kamui also applies to Sasuke’s. So no you are wrong, the manga and character statements from minato/Kakashi have put kamui above hiraishin and since the logic behind their reasons is correct it applies to sasuke’s jutsu as well.
Speed:
Both hiraishin and Sasuke’s technique are instant.
Current naruto's foot speed should be faster than his bm mode as his abilities has been upgraded by both the sage and obito. He may rival juubi jin obito. Yet after getting a head start, sasuke still appeared before him. Take note that, the shorter the distance the harder it is to tell how fast a teleporter and a foot speed user is.
For example in a 10m race between a teleporter and a character with insane footspeed, you would barely be able to tell who gets to the destination first. However the greater the distance, the clearer the gap in speed between a teleporter and a user with extreme foot speed becomes.
If Minato and 8 Gate Gai was to race in a 10M race you would barely be able to tell who gets there first. However lets say minato had a kunai in kumo and he and 8 gate gai was to race, the difference in speed will be far too great for all to see.
The very fact that in a short distance where a teleporter and a user of extreme foot speed it would be hard to tell who gets to the desired destination first, yet Naruto getting a head start, yet sasuke still appearing before him shows that sasuke’s ability is nothing short of instant. Even at such a distance and Naruto getting a head start, sasuke’s speed was still evident is more than enough to say his technique is instant.
As for your preparation, it doesn’t register. Nothing states that sasuke’s was preparing to use the technique, and if anything hiraishin users require more preparation with either administering the seals to weapons then/or spreading the weapons. Finally on numerous occasions seeing Minato forming the seals of confrontation in order to gather the necessary chakra to teleport.
Range:
The only person with a limitless range is Obito. Neither hiraishin users or sasuke have limitless range. Hiraishin users are restricted to seals and cannot teleport at will without it. With little knowledge on sasuke’s technique I believe he may be the epicentre and there may be a radius to where he teleports. But you see if sasuke is the epicentre that means wherever sasuke is, within that radius he can teleport, which in some respect is still better than hiraishin.
We still have limited knowledge on sasuke’s technique yet you feel the need to downplay his abilities as always. What we do know is that sasuke’s technique has the best of both worlds (Hiraishin & Kamui). His technique it instant, but also doesn’t require seals. The downsides so far is that, unlike kamui is has a range and with hiraishin he doesn’t have the versatility. Sasuke is still getting used to his new abilities and once he masters it he may increase this range, but even then I still do not see him teleporting all over the place as that isn’t his fighting style.
Finally his technique is a rinnegans technique. In the latest chapter Kaguya noted that the sage has given them (Naurot & Sasuke) his techniques. Such hype is enough to say that, his teleporting ability should be greater than what we have seen. Perhaps not enough feats and information given, but it should sink in, in due time.