Etherpad?

I don't doubt it, but if you think Stallman is interested in a product because it's "better" than another product then you really don't know what Stallman's values are at all. Stallman's not objecting to it on the grounds of it being poor software, nor is he making the claim that it is poor software.

If someone's on a diet and refuses to eat chocolate because that would be against the point of the diet, countering with "I think you should try it---it tastes so good" completely misses the point.