Why would you trust some corporation to look after your content into the future. At least with Sketch I know I can continue to use the software after my subscription expires. These companies are only one takeover away from jacking up their prices or removing a little used feature that is crucial to you.

The point was that they feel very close to native apps.

It's called export.

I'm not sure a crappy SVG file is going to cut it in the real world.

You're embarrassing yourself out of ignorance (and arrogance). Go export something in Webflow and report back.