Privacy is a spectrum. You can choose to be at one end of it, but not everyone shares your opinion. As a local app your data has a different legal status, and you actually have a lot of control over the execution compared to a web service. For instance, with outgoing firewall rules you could ensure that this is only talking to your email server.
Minified js isn't particularly hard to reverse engineer compared to tools that are geared towards actual obfuscation, and regardless, you don't even need to look at the code if all you care about is privacy. A look at the dev console's network tab should tell you all you need to know.
I've done obfuscated Javascript on a CTF. Only a few hundred lines and I can tell you, it's way easier to just write it new from scratch, especially if you have a product that you like and can just copy.
I’ve reversed and broken real-life products written in JS, Java, WebAssembly and native code.
Minified JS and obfuscated Java (DexGuard or ProGuard) are almost identical in complexity, you can restore the actual datatypes still, and you can even restore the rough outlines of where control structures were.
Obfuscated WebAssembly, NaCl or native code is much worse to work with, and often data structures and control structures are gone entirely.
