I edited my post, my point was that the market for pure offline office productivity suites has become irrelevant, since the competition now is between a pure cloud-based service and a mix of offline and cloud based service :)
The extension interface of Libre Office even lets me think that this would be technically a triviality to integrate.
Maybe with an open standard instead of a propriety and closed eco system,
with the freedom to choose whom you trust with your data, or to host it yourself.