@redsox02
No one's complaining about developing side-characters; In fact, the whole draw of this manga is for Komi and crew to interact with 100 side-characters and gain their friendship. The issue is that, pretty much up until this arc, there has always been some sort of enjoyable payoff in reading and learning about the new character. Unfortunately, there hasn't been near enough investment in these characters for the majority to care. For this character, all that enjoyment ended about 3-to-5 chapters ago and seems like it's going to drag on even longer.
You're 100% right, side characters need to develop. However, when they take the main focus, they had better be inticing enough for us to either want to learn more about them or else to stick around to see how they resolve the situation. Speaking specifically: they should have developed to the point that the audience cares. If not, then the best way to get the audience to care is to directly tie their situation in with characters we're already invested in. Unfortunately, the only character this arc remotely impacts is sweat girl, who (while she was a fun gag character) could move away and never be mentioned again for all we care. We get it - germophobe girl and sweat girl have a bad history that need to be resolved. But whether or not they become better or worse friends won't really impact anyone else until
maybe three arcs down the road. All of this could've been resolved in three chapters or less. Back to being in terms of payoff, it might even be a hilarious gag for the next chapter to skip the rest of the arc and just tell us the bare results of what happened with the two in a newspaper heading. Barring that, the only pleasure in the foreseeable future is this arc ending and getting to move onto the next side character.