I prefer open source software that lacks features (e.g. E2E, which could be implemented by someone), than proprietary software that "supposedly" has some featur

I prefer open source software that lacks features (e.g. E2E, which could be implemented by someone), than proprietary software that "supposedly" has some features (like E2E) which you cannot verify (that is, Whatsapp says they have that feature, but their software not being opensource cannot guarantee anyone that they are stating the truth).