If you have a weak sense of smell then you can’t taste them at all. I can taste most things fine though (la croix excluded) without them tasting bland. Smell definitely adds to flavoring but it’s not like it’s the only thing responsible for how you taste food/drinks.
Signal is private in that other people can’t intercept your messages, including signal. The signal app is open-source so you can be relatively certain it’s not tracking your decrypted messages, unlike closed-source apps like WhatsApp or Facebook Messenger or any other private social media.
Signal is not anonymous from an account standpoint, because you need a phone number to sign up, even if you can choose not to display it in your account.