It's hard to complain to much about a free product that is a side line to the companies main business... Oh wait, we just lost the free version and it's now the companies main monetization scheme? Well now I care a lot about the little annoying bugs I've been dealing with for the last 3 years.
The fact that they don't care, and yet you (or if not you, others) still use it, succinctly explains why they do not care.
If they have a shitty, buggy client for Mac/Windows, and people complain about it but still use it, then they have no incentive to care.