I think Henge/Transformation jutsu can be used in battle & otyer situations that you didn't mention ....
*In battle , by transforming into a weapon , and throwing it at the enemy , the weapon can then turn back into humans who kill the opponent swiftly ...
(Even if the physical bodies can't change their mass or size , that woukd only hinder the main body .... clones made from pure chakra will still be viable for changing into weapons)
* Can transform their weapons to look more fearsome ???
Like , transforming a regular kunai into one of the 7 swords of the mist ???
During battle , anxiety will ginder the senses of the ninja , they may not be able to notice that it is fake ....
* transform into invisibile???
Maybe the jutsu can be used to obtain invisibility ...
* transform into an animal / insect ...etc ???
They can then transform into small rodents to gt into small places & hide , or infilterate protected places , same with insects ....
Transform into hawks or other flying species and take into the air , observing things from above , and travelling fast , whilealso being safe from bandits' or other ninjas' attacks .....
Also , trnsformation jutsu has degrees of mastery ... naruto was shown to be a master at it ....
He could transform into most things , and he won't be detected even by normal dojutsu holders ...
But i suspect tgat may be due to the overflowing amount of yang chakra he has due to a certain orange furball ....
Yang chakra can turn illusions into reality ...
I don't want to beat a dead horse but I can see why so many comments said that Konan is the true MC 😂 this whole chp felt like it was a summary of Konan's power up than the actual MC.
Author-san, how about avoiding Kushina's death after the Kyubi attack?
Using the union he used with Konan, it appears that Kushina dies because when Obito rips the kyubi from her, her vitality evaporates. If Rei could unite Kushina with her seal and entwine her soul and thus share her vitality with Kushina, she could avoid her death. And due to his near death, he would remain in a coma for a few months or years, allowing Rei to gain the benefit of the Uzumaki as vitality or that monstrous pool of Chakra.
Hand signs and wants for wizards are like cars for a normal humans... Sure you can get from point a to b by walking, but you could also drive a car there and do it a lot faster!!
It's not a point of a crotch but more of an upgrade to an existing ability.
Book_DragonKing