"The neighborhood is improving, things will get more expensive". Bad.
"I have to move now." Bad. "This new neighborhood is worse than my old one." Only half true (they started at 3 and ended at 3), but perceived as bad.
They then ask:
> Can someone explain what this description misses and where the harm comes from?
In answer, maybe no harm is actually done. But even so, people will perceive that they have been harmed. And in the larger context of this thread, that is why people are sometimes unhappy with their community being improved, because they believe it will price them out and harm them.
Maybe cows can fly. Maybe a lot of things. But it does cause harm. So your idea about people's perceptions seems condescending
There is no good or bad except in terms of someone's perceptions.