For financials, only the companies still in the dark ages depend on Excel rather than real ERP or accounting software.
Sheets handles pretty much all typical business needs, but we do run into issues if we're collaborating with another company that is using macros or something in Excel.
There are absolutely large orgs in the Google and Apple ecosystems. My org, for example, doesn't use Microsoft except for a smattering of Excel and Word subscriptions to deal with some customer documents that aren't handled well by Google Docs and Google Sheets.
Beer and Books joins with Butts, Boobs, and Babies to make the epic B pentafecta.
Colo-rectal help?
Legal Hold is easy in the Google Workspace using Google Vault and DLP is a native feature-set for Enterprise plans. Audit and investigation features are very thorough and we've used them extensively.
We do use an additional third-party endpoint DLP software with TLS inspection as well.