Seems more like variety. React is in a league of it's own with React Native. For web tech Svelte is cool, for app tech it's not on the radar.
I used to be a web developer, now I'm a React Native / RNW developer.
I don't use web tech unless I'm making a simple web page, when I do I use vanilla HTML/CSS/optional JS.
You get a web app for free when you make a RN app. You can share 95% of code among 5 platforms. (web, windows, macos, ios, android)
Conditionals can change any styling you need amongst them. You can swap out scripts depending on platforms, you can access any extra native platform function with extensions.
Svelte doesn't work for me because you need JS. I don't want to need JS for simple web pages, for apps I need cross-platform.
Svelte could work well for edge computing like CF workers.