I don't understand your objection. It is an amazingly simple tool for collaborative editing and I don't know of any free software alternatives that are as easily usable.
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.
To act like free software can entirely ignore what closed-source software does is a bizzare position to take though. Simply the act of using high quality software (closed or open) gives you insight, inspiration and direction for whatever you're working on.
I know Stallman isn't interested in products because they're "better". But he should be - even if only to push the free software movement to make itself even better.
