No, it's just a "safe" options since less mp drain.
Safe is kind of inconsequential to the argument. You will want to do lower tier cures in Raetic. Using the example above
Raetic +1 - 481 for 31.2 MP:
With Ebers pants = 28.86 MP refunded, so the spell has a netcost of about 3
Chatoyant - 398 for 24 MP
With Ebers pants this cure is free.
Chatoyant would probably have to do a Cure III to match the cast efficiency though in which case they would be negative 7-10 MP to get the same heal amount in the same amount of time.
Would probably be beneficial to just line up the cure values with expected MP return from Ebers and highlight which tiers raetic +1 is absolutely superior and which tiers you actually run the risk of bleeding too much MP.
Plus wiht reatic you open op for ring slot to have conservemp15 in it. that clsoes the gap with 4%
Even more than that if you use two.
This set for cures has +44 Conserve MP.
+71% Cure potency, +30% Cure potency II, +100 Cure+ ,531 Healing Magic ,-61 Enmity(with merits),-80% Casting time(8% from gifts),+44 Conserve MP, Alaunus' Cape: +10% FC
ItemSet 377863
And this one has +61 Conserve MP for Curaga.
+81% Cure potency, +30% Cure potency II, +100 Cure+ ,507 Healing Magic ,-51 Enmity(with merits),-80% Casting time(8% from gifts),+61 Conserve MP, (Alaunus' Cape: +10% FC), Vanya Hood Path C
ItemSet 377864