Spirits and Spirit Weapons
I wondered the same thing tbh, however at the same time it always makes me wonder why spirit weapons aren’t just labeled as minions.
As their mother, I have to grant them their wish. – Forever Fyonna
Minions are classified as “Companions”, which extends to most summoned creatures with AI. As for Nature Spirits and Spirit weapons, its mainly to do with Traits. Because Runes are universal, they call on generic classifications that can be found outside of a given class.
However, because class utilities are designed to work with Traits, they are given unique classifications to isolate them from unintended cross effects from other classes. Also note that most summon skills (the actual slot skill) also match the summon type, except for Eles, which use Glyphs to summon elementals.
http://wiki.guildwars2.com/wiki/Summoned_ally
http://wiki.guildwars2.com/wiki/Superior_Rune_of_the_Ranger
(edited by starlinvf.1358)