You can run a logistics consulting business without windows, but you will struggle without Excel and PowerPoint, and 365 with SharePoint is basically needed for collaboration in any consulting business.
Im also a logistics consultant… try to parse a multi-million line orderlines extract in Google Sheets compared to excel.
I’m also on Mac but to be honest it’s a challenge - there are still enough industry specific tools that are windows only so I have to run a parallels VM to get by.
Collaboration with Sharepoint is I think the biggest issue with M365. It’s impossible to figure out where a file is stored… on your hard drive? One drive? Teams? Sharepoint?
And the biggest problem I have is managing revisions with multiple editors. If I were talking to Microsoft about strategy, this would be the thing I’d suggest. I know it’s common to use Sharepoint for collaboration, but it’s such a Frankenstein’d system that it’s going to be a problem for everyone sooner or later.