you aren't missing much. I found it somewhat disappointing. Especially with the use of what I still call Aions. They have to match an exact criteria to be summoned. e.g. Gladius must be lower than 30% health, and near water and your main character must be near death etc etc. They look great to see, but if you are doing it on easy mode or are good at combat, you will never see them at all. Think I summoned 2 in my whole playthrough.
I hope they fix the issues players saw with the xbox/PS4 versions. Not only the incompatible graphics with 80% of the worlds TVs but also a few gameplay issues that affected playability (not bugs, but game design)