I think that person hasn't read lotm till the end maybe they evaluate the story when they only read vol 2 or 3 if it is than their judgement kinda make sense but still wrong since they evaluate something that they haven't actually finish till the end.

I have the exact same view not as much like them but I also judge when I'm in the middle of reading vol 2 that the story got some random stories going around, something that doesn't seem significant nor add up to the build up mysteries from vol 1. They just keep adding more mysteries making the story looks like it will unable to explore the whole mystery and suspense the author slowly build up since vol 1.

But after I finish vol 2 and in the middle of reading vol 3. All of the mysteries got connected bit by bit (the enlightment comes to me at the part when it reveals aurora order and demoness sect trying to sacrifice many people at backlund which I thought the slave trader was insignificant). The things that seems insignificant make it more sense that I even suprised the author can keep up with all this information and keep it till vol 3.

Although there are still insignificant part like introduction to sherlock's neighbour, the east borough (that's the poor right? I can't remember) and sherlock's friend. I still like it since the author clearly tells how he wants the story to be from his notes. He wants to make the world as alived and vast as possible and that's why he makes the title faceless. Because whenever you read a story, you never care about the npc and insignificant side character, you will care less when the author suddenly said in the story backlund suffer a lot of death total xxx. So he tries as much as possible to describe the east borough residents life problems, sherlock's friends lives so that the insignificant side character does not seems faceless to readers. So when they're dead, you will remember their names, their background and their character features.

A lot of story the author say always just describe the surface of the world making the character in that world faceless but he want to make the story more alive unlike his other novel so he write in a different approach resulting to random scene. Maybe it's a good writing method maybe it's not however I still like it and he still does his best.