Turn dead tuples into temporal data?

Hello there,

I am not a databse engineer but I always loved the beauty and
sophistication of RDBMSes.

I love PostgreSQL and its community and I have also followed Datomic (BI
temporal database) since its beginning.

Would it be possible,(within 1 or 2 releases of PostgreSQL), without having
to change many of other things that PostgreSQL already does pretty well, to
use the DEAD tuples as historical information for native BI-temporal
capability in PostgreSQL?

The main idea (without me knowing much about the internals of PostgreSQL)
is to keep the dead tuples as a mean to answer BITemporal queries...

If small changes can be done (maybe an ON/OFF Toggle) to enable this
behavior per table, it might even free the BITemporal enabled table from
needing Vaccum, at the expense of consuming MUCH more storage.

Specially for financial application BITemporality is an important feature,
and if that is "native" to a DB like PostgreSQL it would put PG ahead of
the game.

Sorry for the "dream" question here, I just want someone experienced to
explain to me why this is a terrible ideal in PostgreSQL.. só that I can
learn more!

Thanks.