@AmigaBruno I don't think that OS4 is much like Workbench/AmigaOS 3.X at all. I think it's mainly about using the Internet, which people could do on another computer, a tablet, or their phone instead. I think the Amiga is or should be mainly about creating things, such as graphics or music, organising your life (budgetting, how to plan a schedule of personal events), or playing games.
AmigaOS 4 is able to do all the things you describe and even more. Have a look at my AmigaOS 4 videos I did a couple of years ago, to get an idea at OS4 is capable to do, starting from
https://www.youtube.com/watch?v=pIXrOqapDnQ
