enemies scale? to whag degree?

Damage, hp, and drop rarity. It means you can go anywhere in the city at any level (after act 1) and both the challenge and rewards will feel good. It's also nice because you can grab the iconics you want for your build right away instead of playing half of the game without them.

You still gradually get more powerful as you get more perks. It's just not as simple as out levelling the enemies anymore.

also heres what one mjnute of modded rebalanced combat looks like

TTK is still pretty high compared to that video, unless you invest heavily in the Cool tree and focus on headshots.