Agreed, but part of that is also the pacing of the story. Not to mention the fact Kenobi was not “dead dead” literally twenty seconds later.
Regarding Alderaan - you don’t see people running and screaming. But what you say about faceless victims doesn’t quite ring true with Marvel because often we do see the victims, or enough of them to comprehend the emotional impact of what’s happening.
Personally I have no problem connecting with the impact of mass murders however large the numbers.