The materia system is busted anyway.
As it is most players will never meld there gear because of how quickly that gear get's replaced. So when you look at the tier 6s and the much larger stats they offer over the 5s it looks like it's gonna create some pretty big problems for players to try and keep up. Especially if they start designing content around the idea you need to be wearing melded gear in order to get through..
Looking at things like direct hit. where t5 is +12 and t6 is +40. tha't s a gaping difference, and if you add it up over all the various materia slots it's gonna add up to massive difference in stats..
On my server currently the variouses tier 6 materias are around 200-300k each (from the few I glanced at) So melding your gear would cost millions. That's something which people just aint gonna pay when that gear will be trashed / replaced in the next couple of weeks...
If I wanted to meld my paladin in 6s for example it'd be 16 t6 materias to fully meld it. at say an average of 250k each. Thats 4 million gil!
My current gear that gear will likely be replaced within a few weeks.. some of my current pieces likely to be replaced in a few days so it just isn't worth investing in it. be replaced again when they add the new tome stones.....
The result is players won't invest in materia for gear because of it's always short lifespan.. so if they end up designing extremes / savage fights around needing those melds. that gonna cause problems. if they design fights around not having those melds though that's gonna cause problems as well cos it'll end up trivialising / breaking extreme level content and end up with repeats of zurvans soar skip drama.
the funny part is players will spend 10s of millions on glamour items like ponchos or mounts. but 100k to meld there gear. "you're kidding right i'll be throwing it next week...."