It's sad that these power fantasy stories focus too much on the female sidekicks nowadays.
I can somewhat understand that having several females as a selling point for the reader is kind of beneficial, but leaving that aside, not fleshing out any male characters(sometimes not even the MC) makes the story very dull.
It also creates the need for the MC to solve everything on his own or, which is worse, to rely on his female companions powers to solve the situation.
And while one strong female character might give something to the story, having several of them just ruins everything.
This manga is a very good example of how the writers ambitions went to the trash bin after he put some energy in writing some tragic backstory for the female characters introduced.
In the end, they become more and more infatuated with the main character and rely on him, even for their own personal growth.
This is a sickening trend, they might not be his slaves, but to be honest, they are more slave-like than the female slaves in most other Isekai stories I've seen so far.
To be honest, it would've been better if they were weak forever (not the Dragon Ball level of weak, where the side characters still can defeat most enemies on their own, but the normal female level of weakness) and completely rely on the main character to flesh out his provider and protector position more.
The way it's currently going doesn't serve anyone/anything, and it's slowly spiraling downwards into worse and worse levels of quality.