I avoid putting stuff on my resume that I don't want to work on again. I just pretend to re-learn Sharepoint for every new job I have

It isn't. Services have limitations, it's nothing new. This isn't about the portion of the app running on Mac, or Linux for that matter, this is because the app is backed by a service that has a name limitation and that bubbles up through teams names.

In the end it's no different than if some service doesn't allow all numeric names or names to start with numerals or be too short, of which there are plenty of constraints on plenty of services.

This is wrong when it comes to content stored in SharePoint, of which resides in content databases or a remote blob storage, but the file names are in guid format, not the source file name, which wouldn’t work for a file of any name and SharePoint due to shredding.

It is MS SQL Server, but I guess that also has its own issues with reserved names.