Dear Brian,
Yes, good point!
But within his own jurisdiction and elsewhere, Fr. Seraphim is venerated privately as "Blessed" which, as you know, is similar to "Venerable" in the RC Church.
There is a beautiful icon of him that has been written, without halo, for such private veneration.
The term "Blessed" is also used in Orthodoxy for those saints whose holiness was unseen by the world but which was attested to by others after their repose.
In the RC Church, "Saint" and "Blessed" at first were interchangeable and there was no difference, except that "Blessed" was often a term given to a holy one by the people in popular devotion.
Later, a system of gradation in the Latin West was accepted with Blessed equivalent to a "local canonization" for a jurisdiction or territory.
The Orthodox Church follows the ancient practice in canonizing/glorifying local, regional, national and pan-Church Saints.
Alex