I’m sorry, but this literally isn’t true.
Ruin III:
- 310 potency
- 1.5 seconds cast time (weaving potential)
- 2.5 seconds reload time
- Doesn’t use any attunement resources
Ruby Rite:
- 430 potency
- 2.8 seconds cast time (no weaving potential, with the tradeoff of doing more damage, although Swiftcast can also be factored in unless you want to keep it for a raise instead)
- 2.5 seconds reload time
- Uses one of two fire attunement resources
And this is just comparing two particular single-target spells; there are differences across the other single-target spells as well.
Again, if you want to argue whether some spells are too similar for you, go for it, but to say that they’re exactly the same is disingenuous. The elemental spells have variations, compared to just having Ruin III with the older Summoner that was spammed frequently without having other variations; I will add that the older Summoner also had a few pet attacks, but those had annoying clunkiness and were often delayed, so I’m personally glad that those were replaced.