Your claim:
That all jobs should have the same performance.
Others:
Note that - the variance between jobs, even of the same player skill level, vary based on that shared skill level and on the particulars of a given fight (even if far less now than was the case in older expansions),
- that it is therefore impossible to balance all jobs for all fights for all players, and
- that it would take little adjustment for the benefit of lower performing jobs' place among the 75th+ percentiles to then simply push out beneath that point other jobs that are harder to learn and therefore would be disproportionately more affected by those relative nerfs.
Your claim:
That shouldn't matter; the jobs should be balanced even for the top. If someone wants to do more for the same reward, their love of the job should be sufficient. No exceptions, no caveats, no matter the imbalances elsewhere.
Others:
Then you're effectively balancing for striking dummies, not content.
Does that explain how that reasoning ensued? You appear to have been the first to conflate practical balancing with results only relevant to balancing done on-paper or for the top 1% alone. That's why the two ends of responses are mixing.