I think you forgot that kamui can travel through any dimension ,so saying kaguya warps him to lava(though obito can fly),gravity,ice or acid dimension is meaningless since obito can easily travel through dimensions ,
Jiubiobito reacted to ftg directly on his body by gudoma defence which isn't instant ,now he can make himself intangible instantly ,he can easily react to any of kaguya teleportation which is slower than ftg directly to a mark on your body
Kamui snipe is all ranges ,that isn't disadvantage Lol
But can he do the Kamui traveling without Kaguya portal ectivated, that mean just raw environment, no
If he can travel to any dimension without synic with Kaguya dimension, that mean he not needed Kaguya portal but opposite happen, that mean he can't travel through Kaguya dimension easily
All Kaguya dimensions just can be access from Kaguya main dimension, and not other dimensions
Obito just able to travel in it own dimesion only
This is also one person here in the base that keep misleading about Obito ability to travel other dimension that not his own.
When is juubito ever react to Tobirama FTG, one when he sent back his TSB ball back to Juubito and one when Tobirama sent sage mode Naruto to attack Juubito with sage Rasengan. That is by using FTG mark on Juubito back by Tobirama.
All that hit him perfectly without even his TSB able to react. He aware but can't do anything.
Same also to portal grab, even some one that having sage power like Sasuke can't react, in Naruto case. I think more to Kishi MC saving effort. Because he keep gaining new ability every chapter without even us readers can't gauge really well how or what is the limit of Naruto speed and reaction. It never establish.
Look currently the problem is prevail in latest chapter, how long Naruto take just to get at Kaguya to seal her, when before he just happen appear in front of Kaguya like instant and cut off her hand. How contradict is Naruto speed everytime.
Look before Naruto unable to even sense and avoid Kaguya appearance behind him in chapter 682 "Kaguya Tears". How contradict is that
This manga contradict much and it have no clear indicative in many thing.
Even feat that Juubito display can happen that it can't be use or become indicator currently.
Because that all this point is directly to instant intangible, the closer the distance and fast portal grab can catch Obito off guard, or using ash bone when Juubito is late to aware/sense. Ash bone/portal grab not show build up chakra like Amaterasu of Sasuke. They are natural technique, just reflex able to save you.
Even Juubito countless time manage to be attack by sudden attack by Minato, Tobirama, even him just happen to relay with TSB and chakra hand as hope of late safe defense.
Show me Kamui snipe is all range where Kakshi need to get closer at Madara TSB shield to Kamui snipe it, and give Guy the opening for attack.
That mean it still short range not long unless state otherwise in manga