Office is moving web based. OWA is first class now, with Outlook New being a thin wrapper around it with some natives. Also their mockups all use macs primarily so “go figure”
There is a long, long road ahead for that to happen. Excel has to not only radically change itself, but so does Power BI. The 3rd party ecosystem has slowly changed from COM add-ins to the JS-based Add-ins, but even then there are many 3rd parties that continue to go the COM route, hence the very long deprecation road for 'legacy' Outlook in the enterprise.
I can tell you very definitely that the OWA apps for Word, Excel and Powerpoint have a way to go before being usable on complex/legacy documents.
So do the native apps. I can type faster than word can render my text.
>Also their mockups all use macs primarily so “go figure”