Besides the unspecified bugs and crashes, I think what's overstated in that blog post is the brave comparison and generalization between OS and proprietary software. Imho it's fairly non-sense, even more 'cause not backed up by specifications or even simple ideas.

I agree one can freely complain on his own blog, but, hey, fact is you're still using a free software and the license is quite clear about it.

No warranty, if it doesn't work as you expect go on for Max. Without bothering yourself and the others. If you really need to do it, you can in a far more polite and constructive way.

As we all know there's a massive amount of professionals working with Pd on Mac flawlessly.

(I would be curious to know how many new blog visits he has in these days)

when i was giving a short Pd workshop in november there was a parallel session in maxMSP/jitter and one of those students came up to me and was complaining that MAX always crashed....
Pd didn't.
just to throw in a equally unspecific report.