I feel the same about GDocs. And GSheets is just insane. I have mixed feelings about Google but they knock it out of the park with their drive tools.
I wasn't aware that Google has a different one. I have never used more than simple sums and differences in Google sheets. Can you give an example where Google offers better, incompatible functionality?
[1]: https://support.google.com/docs/answer/3093343
But working on large files is ridiculously painful. It's just not as as good as a native app. I don't want to give up my ability to work on large files in a performant fashion, which I do all the time, in exchange for collaboration support I do occasionally but a worse overall experience and frustrating lag compared to a native application.