I'm not sure how the math will shake out in the end but the difference between my artifact (which is a fairly high--for normal players--17 right now) and say a guy who's 20... Well, if that difference is 3 now it won't even be 1. That player is doing a lot of work because he needs every single edge in cutting edge content. But his artifact level will probably be the same as mine in 2 months because of the exponential increases. It seems like a pretty workable system.
I tend to overachieve early in the expansions so I can slack a bit later but it's hard to say there's not a lot to do.