Is this to be expected or does it hint at a problem with my build plate heater?
That looks reasonable. I've seen much worse when the screw heads stick up and create an air gap between plate and glass.
You will of course get better printing results for ABS if you enclose your chamber. But this is probably good enough for most prints.
Why do you suppose the left side is worse? Maybe inspect the distance between glass and aluminum there with something thin like paper. Were the fans on? I try to print ABS with the fans off or at least on a very low setting.
As a fun bit, you can see where the UM2 logic board is mounted! lol (pics are taken facing the UM2 from the front). I
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