some doorways allow carrying & freedom of movement.
and some don't.
& locking out opinions that don't fit your definitions
(R. Sheshet instructed R. Gadda to destroy a doorway in the Exilarch's house that was allowed by R. Nachman. R. Gadda ended up in prison and R. Sheshet stood at the prison gates, calling him to free him. R Sheshet did not want a particular discussion about mezuzah on an arched doorway to be taught to the Exilarch's household, as it disagreed with his opinion)