Not underestimating anything, just proved that one teleportation can be faster than another [Hiraishin vs Kamui] same applies for Sasuke's Teleportation as seen.And Naruto now is that much faster... again. You're underestimating Naruto's new speed here.
Instant cannot be faster than instant, this must be like a law of physics or something
That's what you think, I can prove Hiraishin is better battle-wise but it'll take too much time.Great attempt.
However, as already pointed out, Sasuke's jutsu is much more suited for battle. The need for markings is one major handycap of FTG. Ninjas usually start battle a couple metres apart. This means that a FTG user must first throw a kunai at their opponent and then teleport. As you already pointed out Sasuke's jutsu has a range of about 200 metres. Most ninja fights start in a smaller range than 200 metres, which means that from the start of the battle, Sasuke can blitz and one-shot his opponents. The need to throw kunais and place markings, makes FTG less deadly than Sasuke's Rinnnegan tech in battle.
Sasuke's jutsu has no noticeable prep time. One could argue that he waited to attack Madara at the same time as Naruto. If there was prep time, then he wouldn't have been able to dodge Madara's lightning attack.
Essentially, battle wise Sasuke's jutsu is better; distance wise, FTG is better.
I'm 100% confident that I live a far better life [because it's Manhattan after-all] than you do.i'm not dedicated or motivated to analyse certain things about the series but seriously dude well done and also you need to get a life,