You seem to be confusing two different security features that are intended to protect against two different types of attacks.
The three attacks you mentioned are to bypass the lock screen of the phone, and have nothing at all to do with encryption. They also only work in a specific set of circumstances.
Among other limitations:
The phone must be already ...
The biggest threat to your data is likely to be media, format, and software obsolescence. Look back 30 years, and think of the storage of the era. The medium is mostly unavailable today - magnetic tapes, floppy discs, JAZ/ZIP drives, and ST-504 and SCSI hard disks. The data formats might have been dBase, Lotus, Excel, or other proprietary binary formats. And ...
I think there are several points to take into account:
Format: you want the issue contents to be readable, this involves the choice archiving, compression, and encyption algorithms, using formats that are likely to be usable in the future.
Encryption keys: similar to the above
Use case: why/when you expect to use the stored data
I think we should focus on ...