Well that would be a heck of a lot more effort for most games and I would personally hate it. This would mean putting stealth mechanics in pretty much every game, unless some come up with more elegant solutions, and I really don't like stealth. And for some it just wouldn't fit the tone. Obviously you wouldn't want to play a Doom game without violence.
I think this is mostly a non-issue anyway, I don't see anybody complaining about it.
I think this is mostly a non-issue anyway, I don't see anybody complaining about it.