Why would I use REST?

Hi everyone!

I'll get right to the point. Why would I bother with all the great Http Requests included in the iMIS SDK, when I cannot write a custom app with a fetch pointing to my iMIS instance on the same server?

I have seen other answers on this forum referring to security risks? Isn't this what the token authentication is for? I am so confused and frustrated with the iMIS SDK, as I can only properly use it in POSTMAN, but not on my app hosted on IIS. Maybe I have missed something big here.

Would really appreciate someone telling me what that is.