Low level gear didn't matter in XI either except for a few rare pieces that had exceptional stats and could be used for a long time like O-Kotes. The same design can be done for XIV easily by providing unique pieces of gear that can be used for a long time.
BCNMs were much more focused on high-level players as the game went on with a huge number of the battles being at the cap and then later iterations of the seals being largely for cap players as well. There were very few worthwhile rewards in the lower level BCs other than a few specific items like Utsusemi: Ni or the Peacock Charm.
Both of these elements can easily be mimicked in XIV though it'd break the basic design style they've chosen for gear currently. It wouldn't be a bad idea for them to though.
The way I see it is that low level gear was useful for a very long time, real earth time, as your character progresses. While in this game those items become useless in 2 days or a week, depending on play time, only to be disposed as a grade 1 or 2 materia that sells for 50gil anyway. At least you were able to sell a good amount of gear in the low levels to fund your gear for the higher levels.
Another problem is when you level a second job, you might as well wear gimped shit until 50, because in fates it doesn't matter how ill-equipped you are as long as you get in 10 rotations for that Gold medal.
No matter how you want to spin it, this game is less rewarding to the harder working players.
BCNM40 dropped the charms too no? I've only done a few, but BCNMs were also challenging and if you lose, oh boy did it hurt lol. The amount of preparation required was high, and I think that made the game so much better. I dont think much preparation is needed in this game. It's all about gear level. Simplistic and lame.