YMMV, but here are some reasons
- Some people prefer to use Linux.
- Some software runs better on Linux than Windows or Mac (e.g. Docker runs natively on Linux but on Windows and Mac the Docker desktop creates a Linux VM to run Docker on).
- You have a portable, local development environment without Virtual Machines.
I have a laptop that belongs to my employer and a personal Linux laptop. It is quicker to use the Linux machine than to work out if I can now install WSL 2 or find a Linux instance to do some Linux work.
I have pre-ordered one for delivery in October. If you look at https://rpilocator.com/ you will find various models in stock at the official price. The Raspberry Pi clearly isn't the tool for you