It's great that you mention the climate impact of Electron apps, because those bloated monsters truly are a huge problem; though I think you underestimate how much the Tauri team's focus has been on shrinking app size to alleviate the environmental impact made by the download of said huge Electron apps.

One of the things that actually made me interested in Tauri in the first place was their 1.0 Release[0] which included information on just how much CO2 output would be saved by switching from Electron to a similar Tauri app (600Mb vs 3MB)

Of course you're right that if, instead of using Web UI in the first place, companies went straight to native apps then there'd be even more savings to be made -- but there's trade offs to be made with regards to aligning OSs and reusing components and onboarding engineers and writing good cross-platform tests when working in native that just aren't there when working with a WebUI, and something like Tauri which has many of the upsides with fewer of the externalities of Electron should be applauded at least as a step in the right direction.

[0]: https://tauri.app/blog/2022/06/19/tauri-1-0/#environment