You have some valid points: Range setup are easier and you are right, something has to be done, when so many people play one job and other jobs are left out.
But bst does surely not 3x+ the damage of other jobs. You may have seen a strong bst with capped jp and top gear and compared it to a mediocre SMN, then yes. But not compared to an equal DD.
However, it became "unplayable" because it got totally messed up. Right now it cant engage, due to available gear, without giving up alot of dmg. Why anyone with a brain should do it then? So it's just standing there, eating the AoE's, which seems senseless, job design wise.
When Bst group is no longer safe, player will look for other setups. Either another ranged or melee. That's good. What's not so good is, that bst will find no place in them, mainly due to design of Brd and Cor.
So no party play besides the occassionally Bst pt, when it's possible.
And solo? Sure, with trusts, like any other job. What i will miss is the real solo challenge, which always was fun to do, and is very limited now.
Yes, something had to be done. Pet's base stats were too high compared to other jobs, which made bst the superior choice for beginners or lazy people.
And some support jobs need adjustments, so that mixed parties are possible. Pretty sure, if we would have seen more Bluemages in our Bst parties, the wish for nerfing bst would be nonexistent.
Problem is, looking into this needs lots of time, lots of balancing needs to be done. And how easy it is to change a single digit instead. I'm not happy with your work here, SE.