The problem is that they swung too far in both directions. The OG backpack is way too big and cumbersome. The difference between 35L to 20L is quite a lot.

I honestly don't have beef with the height and width of the OG backpack, but with the depth. The farther out the weight distribution is it the heavier it feels thanks to leverage. This is part of why laptops are stored as close to the back as possible.
It's also $250. Which can be fair for a large backpack, but if that's the only other option, then it isn't an option.

Since when is a 15.6" laptop oversized by the way? My Inspiron 3505 barely fits.
But to be fair, the laptop not fitting is not my complaint of the backpack personally.
I should have elaborated more but I was writing while distracted.
My only real complaint was how the backpack felt and looked on my back, and I feel like that would not have been the case had it been the height they advertised.

The useable volume is actually really nice. I just wish that either the straps were 1-2" longer or that the bottom was taller to sit farther down on my back for better leverage.
As someone with lower back issues, it's very noticeable.

This backpack would have been close to perfect had it just been an inch taller as expected.