At least on iPhones though they have a way to activate a mode that prevents the use of TouchID and FaceID. If I press the power button on my phone 5 times in a row that turns that off.

Yes I still run the risk of my device being unlocked against my will if I'm caught by surprise. But I'm able to disable this functionality in places where I think the risk of that may be higher, e.g. while traveling.

I'll still take the trade off of longer password (not just a few numbers) on my phone while using a biometric test for normal access.

Of course not everyone may have the same threats to consider and others may make different choices. Doesn't make either of our choices wrong.