That YouTube video is bad, if not outright wrong.

First of all, like the other commenter said, these days biometrics are rarely used as a key itself (which is how they are often portrayed in old movies). Instead, they are used as a method to gain access to the key. This is quite literally the case with some biometric Yubikeys - the key is the Yubikey, but to get it to work it needs your biometrics. Are you saying it would be better to have a key with no access control at all? Or one with a passcode (just watch the linked WSJ article from TFA - the guy was able to steal data from phones with passcodes, but biometrics would have made that attack vector much more difficult). Phones work pretty much the same way, perhaps the downside being that people often don't consider their phones as something that needs the same level of guarding as an actual key.

And just as importantly, what these kinds of YouTube videos often miss is the old adage "I don't need to outrun the bear - I just need to outrun you." That is, unless you are a particularly high-value target (and you would know if you are), any security that makes you much more difficult to hack than the person using Princess123 as their password means thieves give up and go to the easier target first.