This entire "ranged tax should disappear entirely" stance stands on the assumption that encounters allow for ready and consistent uptime on all roles.
This is true for some encounters, but this isn't true in general. On the one hand, there are encounters in which this isn't true no matter what, or is true with a large amount of effort (like some phases in TOP). But you're also vulnerable to people- for example, the current preferred pf strat in the EU DCs for extreme 1, on the triple group stack+fire puddle in the fire phase, is very punishing for casters. I didn't did that fight with BLM yet, but I'm pretty confident you likely bleed uptime, and at the very least you're losing 3 gcds in Ley Lines.
If they do like, two tiers in a row where you can confidently say that playing Black Mage or playing Dancer yields no difference in uptime and no cost in burst for keeping said uptime, sure, remove ranged tax. But this isn't even true in EW to begin with, let alone the new savage with the re-adjusted boss hitboxes (the one Yoshida showed had a SB-style hitbox that will likely cause melees to lose a few gcds).
Another example beyond the one from extreme 1 I just gave above, in extreme 2, there's a burst window during a mechanic where one of the roles (dps or support) needs to get punted to another platform using a tornado. If dps needs to go across after the party share, Pictomancer needs to somehow fit all 5 gcds on their Starry Muse before jumping cross. The timing for this is extremely tight, and if you mess it up, it becomes impossible to even get your Rainbow Drip proc (the Starry Muse respawns outside of the arena in that mechanic), which, on its own, is like a 600 potency loss in burst. I don't think Picto is particularly difficult (certainly easier than BLM), but it's definitely not without challenges that physical ranged don't even need to consider.
My point isn't even that ranged aren't over-taxed right now, among a myriad other balance issues- they are. DT launched in a disastrous balance state. But I don't think we're at a point where ranged tax should be 0 (or even 1%, honestly).