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Maybe I was spoilt by my first road Shimano experience being 6800 then.
I have had XTR, XT and SLX on mtbs and they have been faultless.
I just won’t by Shimano Road groupset again, especially if you are confirming they are relatively common faults.
Ecobeard-
TBF, Shimano are the biggest and most commonly used groupset out there, so failure are more likely to happen.
To put it in presceptive, i never had a Campagnolo groupset failing simply because I did not service/build many bicycles with Campagnolo in comparison.
SRAM is in-between, slightly more common than Campagnolo, yet do get some warranty issues (even eTap have warranty issues).
I realised I made it sound like it a big issues; it's not, it just the large number of part = higher chance of running into a faulty one.
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What are you doing to your components? My early Ultegra/785 combo of shit has been flogged across the US twice, Europe twice - RD swapped to get a long cage, the original is is still fine, killed a set of rotors but that was my own fault for starting a hilly 400k with worn pads and chewing shit out of the discs (used for commuting now). Scherrit killed a one of the calipers while doing a rebuild once so the rear is a cheaper 105 version. I do still hate the lever throw on the R785 but they work and so I haven't swapped out my new Ultegra levers yet.
edscoble
hippy
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.