I'd still say yes since the context of this discussion is mysql 5.5 to mariadb 5.5 and nothing to do with mysql 5.6 and the time for mariadb 10/11 to become fully compatible to what's brought to the table in that which was the relevant discussion in those blog posts...
And if someone is using upstream themselves they are responsible to manage that ... and assuming the versioned obsoletes is used as discussed yesterday then there would be no accidental overwrite and compatibility if mysql-5.6 is on the system and the admin updated without thinking...