Scenarios don’T scale with ip only with elite tier.
They do vary in difficulty based on the map, what hazard and what enemies you have. For example sniper on hotel is easier than sniper on mansion.
Spectres are worse enemies than draug. Fungi worse than werwolfs.
I noticed that. The combination of things attributing to difficulty. Or the types of supplies you get at the half way point. Some of the bosses I don’t recall hardly ever getting. Maybe I’m just seeing more of them now.
I found that when I encountered a difficulty I needed to adjust my build, usually with an impair of some sort. But like it’s been mentioned above, some mobs are harder than others.
Add Antida to your friends list and look me up in game. Will be happy to help you