Akshually.....
KCD has always had that "problem". It's really more of an action game than an RPG in its combat - if the player is good enough, combat will be easy relatively independent of Henry's current stats.
KCD2 combat is still better, because way less buggy/janky, but it's still the same system suffering from the same issues.
And if someone has played KCD already (or games with very similar systems like Mount & Blade or Mordhau), they'll likely have a too easy time without mods.
I can recommend this one:
Tweaks the combat elements of KCD2 to make them more challenging.
www.nexusmods.com
It doesn't completely change the combat, but basically ups the frequency and variance of AI actions, so it's a bit tougher to keep up with them.