I didnt mean to collect 75 alex for every piece of equipment. More like replacing the original stats. The high allagan coat of healing has 51 secondary stats (acc not count), so the scroll will give u 51 stats.

Also i dont think that it will take the unique part out of novus. The sphere scroll is just one step in the evolution of your relic weapon, and for sure not that last one. So why use this nice feature for only one item.

The materia is an issue for sure. but noone force you u rebuilt all your pieces. It just gives you a workarround if you struggle with acc, mp or whatever.