My next door neighbour is a lawyer. I asked about her workflow when visiting during the lockdown.
There's about 40 lawyers in her office, and they have a lot of ongoing cases between all their clients. She spends some of her time each week "filing". For her this means sifting through the firehose of emails and documents that their office receives and assigning every one to the correct case, marking if it needs attention (and from whom), tagging the types of documents, etc etc.
She does all this from home through a custom workflow built on top of Outlook. I'm sure its not pretty in the backend, but can you name a system that would let her do her job more effectively? MacOS Mail? Gmail? Hah! No. Outlook is the tool they use; and it looks like it works well - even working from home.
I don't use anything in the office suite myself, but for my neighbour's office I don't think there's a better choice. Hate on outlook if you want, it solves problems for real users.
OK, now I know you're kidding.