Having created JavaFX apps in the past: that's comparing mopeds to racecars, because the actual code writing part in JavaFX is so much more tedious. The upside of moving fast and breaking things (which you're absolutely going to with a webview app) is that you move REALLY fast, and breaking things is almost trivially fixed because everything lets you either look at the dev console directly, or attach a dev console in seconds, and off you go setting your breakpoints and var watchers.

(and as always, how bad you break things and how quickly you can determine where and how to fix it has nothing to do with the choice in tech, and everything to do with your experience as a software engineer, or "dev" as we apparently call folks these days)