The parent describe exactly one such scenario. look up truecrypt plausible deniability.

On android it is called lockdown mode and can be activated from the power button long press menu

You are gonna have to more specific about what they did, that link is not very forthcoming.

12x3 is the best, but 4 days off is very expensive.

For sure. The idea that any physical part of your body is a "secret" is pretty laughable on its face.
As you said, it's convenient to touch something or look at something, but it's by no means anything remotely approaching secure, no matter what the marketing material says.
If for no other reason than you don't even need the $5 pipe to get someones credentials, just a guy to hold him down.

Ya, it's funny. Your decision not to pay them for a service you don't want seems to be the only thing about you they refuse to store permanently.

Win11 (and I think even recent Win10 OOBE) requires opening up a terminal and setting some registry keys.
It's funky, but it still works.

Correct.
Which is the 4th amendment, not the 5th, and is also not being argued by anyone, or "the troglodyte judges"

The police concluded that they did not need the warrant, because defendant was a parolee.
Court agreed, as caselaw has determined long long ago, that parolees are not free citizens, they're just those out of prison early.

That's the solution. Having biometrics is equivalent to having a physical key.

And rightly so. Physical keys have never been protected.

Ultimately, all that will ever stand between you and anything you've got protected by a key, is the 4th amendment. A warrant.
If you're worried about a judge granting a warrant to go through your shit, you need shit that doesn't have keys. Then you'll be protected by the 5th amendment.
Of course, then you've entered a whole new territory of not-fun.
Hiding evidence, exculpatory or otherwise, from the police is almost always a bad idea, and it was never expected to be anything otherwise.

Not quite that strict.
The judgement discussed the 4th amendment implications.
The police argued it was allowed because the parole allowed them to violate the defendant's 4th amendment rights- the court agreed.
However, that does confirm that only the 4th amendment stands between them and compelling you to provide biometrics. (i.e., a warrant)

Which shouldn't come as a surprise to anyone, but strangely enough, it is, because most of the people on here have no fucking idea what the 5th amendment actually is, and think it is some kind of ability to protect physical evidence from government acquisition, if only you say "no", which is some kind of meme of some dumbass sovereign citizen screaming "i know my rights" as a judge says, "no, you don't."

Correct- and that's protected.
Nothing physical that can be collected is.

A search of your house was never a violation of your 5th amendment rights.
You are still protected by the 4th amendment, and a warrant would be required, as it is for a blood draw or forcing you to unlock your phone.

In this particular instance, the police concluded that existing authorization from the defendant's parole allowed it. The court agreed.
There was never any 5th amendment concern brought up, because it doesn't fucking apply, by any stretch of the (reasonable) imagination.

Of course not. You are protected against unreasonable search and seizure. A warrant would absolutely be required, just as it is for the police to collect your blood.

That's certainly an angle you could argue, but it's a very loose one, particularly since brain scans that can extract information do not exist.
However, it is an undeniable fact right now, that your stored data is physical evidence. No different than you having written something down.

Stored data is physical evidence.
Passwords are different because they're in your head. They're something you can know (and forget).
Only constitutional protections against unreasonable search and seizure protect you from access to physical data.

5th amendment protects against compelled confession. It does not protect you from the collection of physical evidence, including your biometrics (or even your blood in the case of DUIs and such)