Question comment

Oct 1, 2021
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Buying a mobile phone eg Android 8.0 version,
theoretically contains all the previous basics
improved versions plus recent ones (let'say
Android version 6th Marshmallow, which technology,
allows you to easily convert an SD card
in internal storage).
So this process why does not contained in
all subsequent versions of android (eg 8th).
Based on what logic this is done and how we can, the
users to know , the exact contents in real, of the
functionality included in each version in addition
to camera-photos-giga but also why do not , we do
not have the possibility,something for which we paid
for, to install, on our devices these omissions;
Am i wrong ?