The only serious downgrade here IMO is the IPD adjustment, but for the vast majority of people it's not an issue. In other ways it's a clear improvement. I won't be getting one as I have an Index, but this is going to sell more than any other headset. The tech and the price are both incredible.
[1] https://www.youtube.com/watch?v=_x6lux6f_6g Tested's review is the one to trust. Norm knows his stuff.
Edit: Ah I see about the weight, you must have been talking about the weight combined with the upgraded headstrap, which does indeed make it heavier than Quest 1, by about 7%. I'll reserve judgement on comfort until I try it. Quest 1 wasn't exactly comfortable for me but it's about more than just the weight number.