Who doesnt have computer nowadays lol.
True but I bet you only have one.
Personally I exhibit at quite a few Maker Fairs during the year. Typically I show three or four projects on my stand. If they all needed a laptop then I would have to have a lot of computers. The Pi allows me to have several projects displayed at the same time.
Also if you have a project like monitoring something, like the passage of birds in a nesting box with automatic picture taking then you can leave a Pi to it and still have your Laptop.
You can do image processing type projects without sacrificing your main computer to the task.
The other thing you can do is to run the non Linux RISC OS operating system, used in the Acorn computers of the 90's, it knocks the socks of Linux for speed.
I have four Raspberry Pis at the moment.