I don't see grinding as an issue, I know it's extreme and hard... but, the real problem is what we get in return. Yes, you can't upgrade tome weapons, only once. But by the time people finish on relic weapon, there will be another tome weapon which is easily acquired and superior to current relic. To be honest, relic suppose to be unique and desirable... that's what developers said themselves. We should be able to customize it somehow.. or give it proc ability based on job. BLM for example: 10% chance on offensive cast, you gain 50 INT for 10 seconds etc.