Very easy: the buggy dGPU driver that causes the high dGPU power consumption (20W) when connected to an external screen. By itself, it's fine. Microsoft Teams is a power hog and fine by itself, too. When using MS Teams when connected to an external screen, the fans go crazy. Unbelievable. My workaround so far: when using Teams, disconnect the external screen.
I don't understand the flak the camera gets. Yes, the specs are lower than non-mac laptop ones. But when I videochat (all the time these days) with users on both macs and PCs, the quality of the mac camera always stands out. A lot.
I'm not a big fan of the TouchBar. I thought I would be. It's okay, but not more. With an external keyboard, I can still use the F-keys to adjust volume and brightness, which is nice.
All the rest: mightily impressed. Sometimes I wonder if I should return my refurb 8-core 64GB 2TB with 8GB dGPU for the external screen issue. That problem is bad. But then this refurb cost me only €400 more than the new 2020 13" with quad core i7, 32GB, 2TB. So the price I paid is mighty good. And the rest of the machine is pretty incredible, too. Ultra portable, ultra powerful. For that, I can live with a small compromise for a specific use case.