If not for their initial response to the first round of feedback, namely to put a "we're still doing it" at the bottom of their original blog post (with completely unreasonable and unjustified explanations for why), I'd give them full credit for responding appropriately. As it is, though, at least they fixed this. They're still going to need to deal with the giant pile of patrons they drove off; many people lost a significant fraction of their support because of this change, and that won't necessarily come back.
Between 1 and 2 years ago, I talked to some folks at Patreon about an unrelated topic (namely, trying to use Patreon for registered charities). They mentioned at that time that they had a change in the works to shift processing fees from creators to patrons, which they said at the time would be "better for creators" for various reasons, but that didn't want to talk about the details yet. (Since the issue is now public, I don't see any issue with saying that now.) That discussion naturally didn't include any information about fee structure or un-aggregation of charges with associated additional fees, e.g. the "$1 costs $1.37" problem, since that wasn't the topic; the impression they gave at the time was that the only change was to pass on the (presumably still aggregated) fees to the patrons, which wouldn't have been as serious a problem, and wouldn't have killed Patreon's suitability as a wildly successful microtransaction platform the way this change did. So, they've been thinking about this for a long time, and yet they sprung it on people without warning and without running the full details by anyone.
Update: there's now a survey from Patreon asking for feedback: https://twitter.com/Patreon/status/941010263385374720