When you say web platform do you mean a browser? Using a browser is the mosted optimised and performant over installing an application on your desktop?

Curious what desktop do you run your browser under?

I would give you an example of a simple video split application. A web platform requires uploading, downloading and slow processing. A local app would be hours quicker as the data is local.

No reason a video splitting app couldn't be written with client-side JS.

That sounds like it’d probably be slow.

So please do.