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croft
To go through your experiences, the calipers is not uncommon with all of the Shimano one, so the fault isn't just down to the R8020.
The left hand shifters is again, not uncommon which is due to the design (Tiagra 4700, 5800, etc. have similar issues).
Disc warped, not uncommon again, more suspecible with 140mm rotor, I didn't find the latest rotor to be decent, as sometime they squeal a lots, fitting a normal centerlock rotor sufficent.
And lastly, the BB is always hit or miss, depending on the frame (not faced properly mean it's more likely to wear out sooner than later), I'd just fit the cheaper BB on.
Incidentally, your experience of 6800 is pretty accurate, for some reason they were the most reliable Shimano 11 speed groupset insofar.