There was a time when that was BSBs. Except BSBs and Lifesiphon/Wrath severely fucked up the power curve.
Like the jump from SB to SSB felt correct.
The jump from SSB to BSB was astronomical, it made a whole lot of things super redundant.
I don't know if I agree with that. Recall that the first BSB was for Cloud and remained exclusive for a over month before mortals trembled before the force that is Tiny fucking Bee... Squall's was next. Really BSB's didn't show much power till Cecil due to the en-element giving his follow up entries massive AoE power, the commands were still trash, you used Saint Cross. It's really not till Vaan though that we start to see them come into their own. Even the first few White Mage BSB's were lack luster.
I think the BSB balance issue has been more a recent problem than a long standing one personally.