Smudge should become the standard for caster dashes. It actually really helps with quickly repositioning on the archetype with the most limited mobility due to, well, cast bars.
DNC's gap-closer doesn't matter nearly as much because DNC never really has this problem- they can just walk while doing damage. Smudge lets you "greed" a cast if you know what you're doing. If I could, I'd make Aetherial Manipulation a copy of Smudge. Feels great to use.
PCT, compared to its role, is stronger than RPR was. RPR wasn't even top melee dps, it was tied for first iirc when savage hit.
But I agree with the people saying that PCT is fine- it really is. The job is one of the hardest to push to 99%, you really need to know what you're doing. The problem is that the caster role is chronically underpowered. This was already a problem in EW, where melee uptime was free- RDM was extremely undertuned through the entire expansion. Now it's both RDM and BLM. I'd keep PCT where it is, bump BLM to outdo PCT in adps consistently, and bump RDM up to low melee levels. I know SE is never gonna let RDM overtake melees because of the raise, but at least keep it 2% under the last melee.
(You can construe a similar argument for physical ranged, but this thread is about casters. But you get the idea there too)
I'm deliberately ignoring SMN because SMN is an abomination in the role- it's more physical role than it's a caster, and it makes casters nearly impossible to balance. I actually think it needs another rework... but staying as it is, give it whatever damage BRD has.
I haven't run the numbers yet, but I doubt this is true. If BLM became melee levels and what you're saying were true, then triple melee would already be optimal (since we're comparing BLM to a melee). People underestimate the multiplicative nature of raid buffs. But, again, until I go crunch logs, I cannot definitely say so- although never, in the history of the game, was running 0 physical range optimal (it literally never happened), and while physical ranged balance is pretty bad now, we've had other periods where it was basically comparably bad before.