[ShamelessC]

What? The use case is to easily run it on your own computer. Without needing to be a programmer or install an application.

[asynchronous]

Just like what most web apps allow- quick applications in a sandboxed environment on almost every type of hardware

[lionkor]

Any hardware! As long as that hardware is overpowered for the job, so that the browser overhead is acceptable. Oh and it needs internet. Oh and it needs a reasonably large screen because padding and margins. Oh and it needs quite a bit of RAM to start. Maybe not any hardware.