If the big architectural differences between Electron and Tauri came out in Electron's favor for your project (i.e., if differences between rendering engines we

If the big architectural differences between Electron and Tauri came out in Electron's favor for your project (i.e., if differences between rendering engines were a real problem in practice), then I'd say it would almost certainly be a mistake to choose Tauri just to avoid having to do FFI. Of course, if rendering engine differences aren't a problem in practice, then the choice is much lower-stakes and what you're currently doing will probably be fine.