I just cannot get past that camera bump/slab. Any case that evens off the back of the phone is going to make it very thick. I'll be sticking with my Pixel 5 until at least the Pixel 7.
For comparison of bump thickness (based on rumor for nonreleased models):
Comparing Google's 2021 model bump in thickness to the 'big 2' 2020 flagships
Pixel 6 Pro:
2.6mm (?)
Samsung S21 Ultra: 2mm
iPhone 12 Pro: 1.7mm
iPhone 12 Pro Max: 2.79
Pixel 6 Pro comes in a fair bit thicker than some, but is still not the thickest - and again, this is against last year's flagships. I believe it's far more relevant to compare it against the updated competition it will face, below.
Comparing Google's 2021 model bump in thickness to rumored bumps of some yet-to-be-released 2021 flagships:
Pixel 6 Pro:
2.6mm (?)
Samsung S22 Ultra:
2mm (?)
iPhone 13:
2.51 (?) (32% thicker than Pixel)
iPhone 13 Pro:
3.56 (?) (87% thicker than Pixel)
The thicker the bump, the more prone a phone will be to wobbling on a table if it is isolated to one side, so here the Pixel should hold a functional advantage.
But keep in mind that while yes, there are differences in thickness, we're talking about fractions of a millimeter here... 0.1mm is about the thickness of a single piece of plain paper. The only phone above you'd likely really notice a difference on would be the iPhone 13 Pro (if it's actually that thick) which would be about 10 sheets of paper thicker than the Pixel, or about 15 thicker than the S22 Ultra.
Where the goal is to allow more and more powerful cameras, the module is, by current technology, going to remain thicker than it has in the past. 2022's crop will likely not see a lessening of the bump unless (a) technology takes a large bound forwards, (b) OEM's lessen their focus on ever-increasing hardware capability, or (c) OEM's thicken the entirety of the phone (more battery, please!) to either partially or fully allow for the module to fit within the normal body of the phone.