I'm doing it because I'm having trouble getting good first layers across the entire bed -- either the center is squished to paper thin, or the edges don't stick.
My print bed is 0.25" MIC6 that I have triple-checked is as flat as can be measured. But in careful measuring with a dial indicator, it sure seems like both my X and Y axes have decent warps. If I get the very X+Y center calibrated to 0.0 on the dial indicator, a map of bed height readings is:
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-0.17 | -0.09 | -0.21 -0.08 | 0.00 | -0.09 -0.23 | -0.10 | -0.16
I'm wondering if I should tear down the rails and scrub/solvent underneath them, or if this level of variation is normal and I should just go straight to BLTouch to compensate.