i know the change felt welcome and was of course noticeable, but thats not my point. my point is this: if i had asked you how you felt about whm in shb, what would you have said? if i had asked you in stormblood, what would you had said? had the change to glare never happened, would you have thought whm desperately needed a 1.5s cast time on glare, or that it needed something like ruin ii? Did you stress over the lack of weave windows in shb, or did you just clip your gcd? did you plan out your lilies to get maximum value for mobility+double weave+healing? did you practice pre-positioning & try your hardest to slidecast on even the most movement heavy phases to keep 100% uptime?
just like the vast majority of whms in endwalker thought whm was totally fiiine despite having very obvious mana issues in longer fights (hint: its because they had bad gcd uptime), the vast majority of whm mains in shb did not in fact stress over gcd uptime and slidecasting, much less in any content lower than savage. you can call it jank or job depth but it was very real, and one of the main reasons lilies got so devalued in EW was because with the 1.5s cast times the go-to mobility & weaving tool (lilies) was no longer useful for any of that. thats why lossy afflatus misery was such a huge deal in EW but not in ShB. but i guarantee you that the majority of whms did not know all that, they probably just thought oh misery is a cool damage refund heehee blood for the blood lily.
switching to the healer i know best for more demonstration; giving 2 charges to draw had some very significant side effects on how AST plays cards. those of us who like theorycrafting and optimizing spotted it minutes after reading the media tour tooltips, while the vast majority of casual asts still use cards willy nilly. what giving charges to draw did was making it so it was optimal to hold 3 cards for raid buffs, making a change that would have probably been nice ("oh hey, i wont drift draw anymore!") into something that makes the entire job feel a lot worse ("oh great, now i have to cram like 6 ogcds into every divination window, meaning i have to hold lightspeed exclusively for burst and also largely ignore cards until the next repoener").
when i say they can add nuance to jobs that what you call "the downstream playerbase" would not notice, i absolutely mean it. its like... when sch could micromanage fairy embraces. it raised the skill ceiling incredibly, but having the fairy on autopilot was perfectly fine too for everyone who didnt want to do that. simple jobs can absolutely have things that seem simple or unnecessary but have more to it on a closer look.
if you burn lilies in downtime and reduce assize cd so much that you clip into the cooldown and lose uses of it, thats a damage loss. it absolutely would add more depth than "try to burn as many lilies in downtime as possible". you would also try to time lilies to manipulate the cd to fit assize into raid buffs, and thats just off the top of my head.