In a hilarious twist, during 12S prog I found that, during Limit Cut (yes another one) the range on Medica is not enough at 15y to reach the other side of the arena to heal between LC dashes. My workaround? To use Medica 2 and purposely clip the HOT, because it has 5y extra range (and matches Rapture's range). The boss isn't targetable during the phase, so the 'loss of damage' isn't a factor, and people have to be healed between each damage instance such that the 3 (maybe 4 cos of chargetime) Lilies you get are not enough. So if Rapture/Med2 are 20y, why is Med1 still 15, is my question. And if it's for parity with AST (Helios/AspHelios/CO are 15y), then why was Rapture made to be 20? Confusing my poor brain. But yeh point being, my 'strategy' wouldn't work if I had a 15s CD on Med2 as suggested, and I'd have to do something else for it. I can't go more middle cos there's proximity baited lasers, so it's kinda weird to work around. I have taken to purposely holding Asylum and Temperance both for that part, just in case I'm still missing people with the casts because I'm too busy looking at numbers and dashes and lasers to see if I'm hitting everyone with my heal, which is probably not optimal but hey it (was) week 1 so optimal can bugger off for a few weeks
If you wanted to 'childproof the healers' and stop people from clipping their HOT by spamming Medica2, rather than 'forcing it' ie with a CD, massively incentivize the alternative. For example, we see people using Freecure because they see they got a trait that says 'oh you have a chance to get a Cure2 for free!'. So add a trait that says 'When you are affected by Medica 2 or Regen, your Cure3's MP cost is halved'. Ok, so now you're incentivized to, instead of spamming Med2, put up just one for the party regen, and then you can push more Cure3. And because Medica2 is 250p on cast (or maybe it's 150 when you first get it, idk anymore cos of that 85 trait), and Cure3 is like 550 (later 600), the BIG GREEN NUMBER from Cure3 will tickle the newbie healer's dopamine receptors and make them go 'yes I am god' moreso than the smaller green number being caused by Medica2 spam
MP economy discussion is a whole other can of worms
We've had our melee die to using LB when the boss in 12 doorboss takes away platforms, because DRG/MNK LB moves your character's position. This, in the same patch that fixed HighJump and Jump to specifically NOT do that. I guess they thought 'oh DRG can't do it's burst on time if Jump is delayed by a bind' but they didn't consider they could accidentally fall through the damn floor if they LB at specific times in the fight, classic SE oversight.
As for tomes, I assume the reason they don't up the cap on uncapped (so, astronomy last tier, currently causality), is that, for example one week ago when the patch went live, I could trade my 2000 stocked Astronomy into 500 Causality, allowing me to effectively stockpile 2500 'uncapped tomes' for crafting stuff. If that limit was upped to 4000, even for uncapped only, that'd go to 3000. Maybe it doesn't affect much of anything but SE probably sees it differently. Poetics has zero excuse, since it's for old stuff only and you can get like 400 at a time by just doing MSQ roulette each day. It'd help people with older relic grinds too, being so stocked on poetics when they decide 'you know what, I kinda like the look of the bingo ball AST wep from HW'.
Now, you want a 'real' tome related change, here's what I'd do: change the name of Poetics to 'Allagan Tomestone of Histories', to link it to how it's for old stuff. I get that Poetics was the final tier of tomes from ARR but come on, have some theming about it