I guess he means purely in terms of open world vs levelled enemies. But here is a question - if in your open world RPG with no scaling you would stand zero chance as soon as you are out of the area you are supposed to be in, is it really an open world game, or is it a guided tour like in Disney World?
I wouldn't call Gothic 1 "a guided tour like in Disney World". Just because you can pick a fight with someone who outclasses you doesn't mean you should. If anything, this was one of the Gothic series strong points: the world not really giving a fuck about you being The Chosen One (aka the player), which was made even more painful by NPCs robbing you as you were laying helpless on the ground.
Conversely, if in your open world RPG with level-scaling you can skip directly to the big boss fight, and the story allows it, does the RPG progression really matter or is it just token stuff?
That's why I am a strong proponent of combat being a dangerous affair (and, in effect, funneling players into using others means than combat alone to accomplish their objectives). There is also a question of believability - how realistic it is for some no-name to bypass everyone and reach the big boss? Especially when the player character is not skilled in pretty much anything? To me it's obvious he'll fail somewhere down the road. And that doesn't even touch the question of player KNOWING who the big boss even is and where he is located.