innodb_undo_tablespaces would be better default >= 2

innodb_undo_tablespaces is default 0. which makes undolog shares ibdata file.
This may lead to no truncating because undologs are not independent files.
And this will cause very big ibdata1 file size, occupying much disk capacity.

And this variable can only be changed by initialization, which is kind of inconvenient.
would it be better to set it as default 2?