At the same time I think the issue you link really highlights what some people have been saying: stable quality of the core product hasn't had the focus that customers would like it to have. Apparently you changed the line-wrapping behaviour twice in a year, without even realising that 1) you changed it, and 2) that some of your customers rely on this being stable. Of course you could argue that it was silly to rely on this behaviour, and that the new behaviour is in fact an improvement. But personally I think functional stability is important to all customers, and the fact that this was not a deliberate change is odd.

Obviously such a small change will never drive away customers, but I do think quality is the difference between having users and having users that are also ambassadors that will recommend your product.