Whether it’s possible or not will depend on the scaling tuning. And I don’t know what that’s like at all levels at the moment.
My impression is that it will be fine at lower levels, but definitely by the time you get into the late 50s, you will be feeling it pretty hard. Maybe before then; scaling tuning isn’t exactly perfectly consistent.
I found this thread.
Towards the end, the OP says he is level 35 and heading to Outland.
That was a year ago. He didn’t make it past 40.
Was that because he just got tired of it, or did scaling catch up to him? I don’t know.
You might be able to dodge and weave by going into and out of Chromie Time to adjust the effective level of dungeons past level 30. I know you can do that, and I know it will be successful for completing dungeons, at least if you repeat them enough, but I don;t know how efficient it will be.
Personally, I don’t think it’s a great intro to the game just to walk behind someone effectively soloing a dungeon, sloooowly. And I don’t see how trudging through dank holes in the ground conveys a sense of scale of the world better than being IN the world. But different people are different. 