Having this discussion before Savage is somewhat pointless because, presumably, they're attempting to reintroduce melee uptime concerns (smaller boss hitboxes, actually working for the few positionals left, etc).
I agree that, in EW, melee were basically physical ranged because of the bloated boss hitboxes, but that has more to do with the poor encounter design than the jobs themselves.
You also absolutely cannot run double caster without losing damage. Double caster is awful, because any of the non-Pictomancer casters are substantially weaker than melees.
Like, I agree that MCH needs a decent bump in damage, but I disagree with the general premise that free perfect uptime shouldn't be taxed. There are fights where you will struggle to maintain uptime in some jobs, and doing so usually incurs a substantial penalty to your burst (TOP p6). This is even true with the current extremes for some jobs.
And I also generally think that if you need to work 5x as hard to get perfect uptime (usually as a team), that should have some non-insubstantial reward. I remember the voodoo I did in Shiva (E8S) for perfect melee uptime, we ended up adopting a much riskier, harder to execute strat. In a universe where BRD and MCH are comparable to NIN and SAM, we simply would never run those two jobs.
This comment is interesting because, imho, Picto and Viper are much closer to the "classic" design of their roles than the recent reworks/additions. Picto has a number of fairly long casts (although it has tools to help it deal with modern encounter design) and definitely feels like a caster (unlike the reworked SMN). Viper has a fast gcd and quite a few positionals, which is reminiscent of the older versions of MNK.
You can tell that the cast bars on Picto matter because it has a differential between the 25% and 50% percentiles, and a differential between the 50% and 75% percentiles similar to Black Mage's, which is usually the case for jobs whose damage is gated behind gcds.
There are certainly severe issues with the current balance that need addressing, but saying physical ranged don't have an advantage in keeping total uptime while handling mechanics is disingenuous. Are they overtaxed? Yea, I agree with this. But I'm not comfortable in saying that mobility should be free- you'll have a hard time convincing me current SMN should be within 1% of current BLM or PCT.