I agree with this post, and for me it is incomprehensible that the developers would even think of having another item level power gap (750-800) based on drops because I had the impression that they saw this as a problem in the past.
If you remember, we had the situation in Season 2 where the maximum item level was only guaranteed by Duriel and world bosses, which made all other content feel like a waste of time. Especially when it comes to weapons, where max item level counts so much for base damage.
Fortunately, the developers have moved away from this.
On the PTR we have exactly the same problem again, only worse. The increase in power makes most of your non-ancient finds, unique or not, almost worthless. Not only because of the weapons, but also because of the higher max stats for every affix at ilvl 800. It is quite big in some cases:
https://imgur.com/JX6LUKi
There has been talk by the devs about looking into white / blue items in order to make them less useless. What baffles here is that with this change they have basically trashed another item category (non-ancient legendaries).
If you ask me then I suggest to move Diablo 4 far away from item levels as the main power indicator, because this design always runs the risk of making content (items, leveling, various activities) redundant.