Lots of shops struggle to avoid O365 because "everyone is used to Word", and once you have an Excel macro that's mission critical... game over.
I think the automation and Enterprise document management story in GSuite is just better than the Sharepoint nightmare and heavyweight knowledge-graph approach of O365. I think going over to O365 would be a lot harder than the opposite, for an advanced user, thanks to how automation works on those platforms...
Correct and in this case, that was exactly what happened except with the GSuite benefiting.
There was a number of Google Sheets that were automatically populated by database queries on an hourly basis. These were regularly viewed by the L1s (such as daily orders, distribution statistics, accounting summaries) and the Sales team (who wanted to know their commissions ASAP daily).
Then you had a bunch of managers who used those sheets to do light analysis with macro magic.
Automated Google Sheet reports, easy to maintain organizational documentation.
One was acquired by a S&P 509 and forced to convert to O365. The CFO quietly carved out an exception in the budget citing "conversion costs" so Accounting and Sales don't have to convert.