It's also the case that, at least for Postgres, building a new low-level storage format isn't feasible until PG13. And also this approach allows us to leverage

It's also the case that, at least for Postgres, building a new low-level storage format isn't feasible until PG13. And also this approach allows us to leverage alot of the battle-tested stability built into current storage layout with TOASTed pages, without starting from scratch.