Different OSs have different norms, expectations and design languages.
What I'd like to see is something that abstracts as much as it can but still allows you to make something look like a native app on that platform. That would mean you'd need to do some programming for each platform but honestly I don't think there's a good way around that.
The solution isn't Electron. Way too heavyweight. Wayy too resource intensive. Way too risky by having a huge attack surface.
An additiojnal problem with Java is bundling such an app. Requiring a JRE on a target platfrom is (IMHO) a big problem. They're far from universal now. Something that compiles to a static binary. There have been efforts to create self-contained standalone packaging for Java applications. My understanding (which may be incorrect) is that all of these solutions are still somewhat suboptimal.