Problem is that a longsword +1 should not be nothing.
It is because a lot of items are really powerfull.
This idea i like a lot more ...
Basicaly dont buff up other artefacts ... just flatten their inpact so even others feels good to find. ^_^
Purrfect!
In the full game there you could be probably 8-9-10.
In Grymforge?

Hardly ...
I mean in previous PFH Swen litteraly said to us that "if we keep asking, maybe they will include level 5 to Act 1" ... hear that difference, not Early Acess, ACT 1!
Wich would mean that they can potentialy plan to keep level caps for each Act, so they can easily expect our power in certain encounters and adjust them for that.
ON THE OTHER HAND ... just to be clear.
I understand it might be just poor wording, and i agree with lot of people who are thinking that would be most horrible idea they could potentialy have ... but its still possible. :P
But still 8 - 9 -10 is really overrated, since 10 was original level cap for whole game and Swen told us that it will be "slightly incerased somewhere abowe 10" ... i really doubt they mean by that it would be doubled.

So i dare to say that if we will be really lucky, we could potentialy squeeze level 6 out of WHOLE Act-1 (Moonrise included) in full release, but i doubt they allow us to get much higher.