Not exactly, the chromium/chrome sandbox isn’t dependent on how and what code you execute the electron/node one is and that is because the latter were designed

Not exactly, the chromium/chrome sandbox isn’t dependent on how and what code you execute the electron/node one is and that is because the latter were designed to execute code across many more privilege levels than what “dedicated” browser needs. If I download and build chromium (as long as I don’t disable the sandbox altogether) I don’t actually need to think about those issues while I do need to do that with Electron.