I make use of great form spirits fairly often actually.
In 4th edition everyone who could astrally perceive could make a basic ward, so that included adepts and aspected magicians as well.
Everyone with the conjuring skill could summon a watcher.
Ally conjuration was a metamagic, summoning great form spirits was something you could do if you learned the Invocation metamagic. So both things were definitely available to aspected conjurers.
In 5th edition all of the above are now suddenly rituals. Imo this has more to do with an attempt to make the ritual spellcasting skill relevant, which it more or less wasn't in 4th edition. I don't know if it was an oversight or what it was, but I agree that it's silly to deny aspected conjurers these abilities, there's little enough reason as it is to play an aspected magician, since they were already hit very hard with the nerf hammer from 4th to 5th edition.