How zonked out is he?

Wtf is going on

They got lost in the sauce

That's how these things normally go. A "regular" person gets isekaied and they somehow turns into a battle hardened adventurer who has no problems killing. It's what the edgelords want, but in my opinion makes a boring story. At least show how they change.

We might find the one piece before we find the end of this date.

Who?

You named a trio and the thing they sealed up, that's four entities plus the dragon, that's 5. So you are saying 5 per city is enough to say it's not a cheat power? If you extrapolate to infinity, sure.
Now that trio plus the dragon is out of play, they can no longer compete with MC, making his power level more unique. Remember, I said, "...cheat ability is unique or at least extremely hard to obtain, which gives you a massive advantage over other people in one way or another."The intention of that was to say you get a massive advantage over others, as in if they where to fight or compete in some way. This does not include things that are removed from the picture already. Like the dragon or the trio you mentioned. And even if you include them in the narrative "present" as you said, that's still 4 per city as of this point in the story.

Why would a scope not work with it? Having a spotter and a scope is the best option.

Probably plot reasons.

But he is. He remembered everything from his past. Politics, physics, chemistry, architecture, agriculture, and more. He jumped from the medieval age to almost the modern age in a very short amount of time.

Hmmm. I sense that there might be a smidgen of complicated loved affair in the party. I can't get my finger on it but it's just a feeling.

Then let's switch the roles around and say he did that to a girl. Would that be the same?

NTR LETS GOOOOO

OK, you named 5 people and a place. Do you think that's a lot? You just proved yourself wrong. I asked for a handful of people from EACH city like you said. Also, 3 of those are "dead," and one of them is a place, so do they really count?

Sus

The thing!!! He said the thing!!!!!

Or he makes the ultimate sacrifice

The real world stuff is stale because it's like a generic power fantasy. MC is overpowered and overconfident, while in the murim world he is the same but gets humbled every other fight. Maybe it will change and the real world will start to get interesting, but I wouldn't get my hopes up.

Agreed. The murim world is much better, but if I have to suffer though his real world stuff to see the murim world, I'll do it.

Like I said, who have we seen that has that level of power? Can you name the handful of people from each city?