You're basing your information on the current setup of relics and not on when it first came out. It's possible the XIV version may go through the same evolution as time progresses but you first have to think of XI like this:
-3 days in between a run
-500k-1mil entry fee each run
-run through hoops to spawn the parts for attestation and shard
..
But since you are now talking about the Magian trial version you have to input the following requirements to make a weapon which is worthy of being used for 99:
-Use Metatron Torment 200 times against Lizards. (process of building up 100 TP and using it on a lizard type mob, and missed WS don't count)
-Use Metatron Torment to deal the finishing blow 200 times against Plantoids. (now you have to land killing blow with WS so you beat off mob til you feel comfortable with using said WS)
-Use Metatron Torment to deal the finishing blow 300 times against the Undead. (same as above)
-Use Metatron Torment to deal the finishing blow 300 times against Plantoids. (same as above and it finally rewards you with the lv 80 weapon)
-Use Metatron Torment to deal the finishing blow 400 times against Dragons. (I'm sure by now you've spent weeks reaching this part lol)
-Defeat Goublefaupe 5 times with Bravura (85) equipped. (which is easier now cause of changes made to dynamis being onec a day plus the fact said NM is a pop now so you can do it in one run if you have said pops)
-Defeat the Animated Great Axe 10 times with Bravura (90) equipped. (same as above easier now cause of changes with Dynamis)
-Retrieve 5 Vials of Umbral Marrow and turn them in to the Delivery Crate in Ru'Lude Gardens at (H-5) next to the Magian Moogle.
**To obtain said item you have to face off against "Arch Dynamis Lord" to face off against him you have to do the following
***obtain Fiendish Tomes 26-30. Now where do these come from?
****Each Tome comes from a boss NM in Xarcabard, 4 demons and Dynamis Lord
*****Each NM has a pop you have to farm, then you have to farm them for the tome, then you have to take that tome to spawn the arch dynamis lord and beat him.
So ya.. think Xi stills wins for being tougher lol