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Problem is that you don't create PVCs yourself usually but the statefulset manages them based on a template.

Online resizing of pv has been possible for quite a while. The complaint from the author is that you can do this for any existing pv that was created by the sts pvc definition, but scaling up the sts will create a new pod and pvc using the original spec. Altering that spec in the sts manifest is unpleasant when it really shouldn't be.

How consistent have the results been? I used this in the past with some flakiness...

Not OP, but I've been doing it for a few years. Can't say I've ever seen an issue - with Prometheus Operator, which the article mentions, as few times as well