I find it fun having to move between the ranged and melee attacks during Flourish phases. Like others have said generally you’re going to be in melee range of the boss anyway and when you aren’t it’s easy enough to En Avant towards to the enemy. I generally stay at the centre of the party anyway, so I can hit as many targets as I possible with Curing Waltz / Improvisation if they’re needed (depending on situation of course)