Can you name a single Android phone or tablet model that is <10 y.o. for which you can access personal data with this method?
Obscure Chinese brands made such android phones for few more years.
All Google Pixels (2016 and later), and virtually any android phone made after circa 2018 are safe from naive bootloader attack: user data is encrypted, plus you have to "OEM unlock" to even get the recovery to run.