The thing is what different mechanics, as of right now the only thing that distinguishes the 3 current primals is movement, if they release the three new ones and ramuh has long casts and shiva is all instants then ramuh becomes purple ifrit and shiva becomes blue titan, distinguishing on astral flow really isn’t enough because none of the primals are built around astral flow being their core mechanic (maybe titan could claim this), you don’t have to build towards astral flow, astral flow is disconnected from gemshine spam, it’s really there to fill GCD’s to reduce how much pure ruin 3 you are spamming
As for gemshine in the Demi phase I wouldn’t say that’s impossible, but again it really doesn’t change much, and if they intend to make the job 1-2 with gemshine and ruin 3 then why isn’t it like that already considering old phenoix already had that, but let’s say they did that, would the job really feel or play any differently
As for jobs I would argue got good changes, if you specifically want EW then I would say paradox, paradox was a fantastic addition (surprise surprise it’s on BLM), it changes the way you interact with each of your lines, opens up new line opportunities and also doubles as a movement tool, you can even create whole free movement rotations around spamming paradox, that one skill alone completely evolved how you can interact with BLM
If we go back further I’d argue what HW added to WHM was fantastic, WHM always struggled against SCH in ARR because SCH could more easily abuse cleric stance, giving WHM 3 oGCD’s that each have a different function and also buffed WHM’s damage quite significantly is an example of a change where they knew exactly what was wrong with a job and made simple changes to it that completely changed how you interact with it as a job
In comparison shiva replacing Garuda just feels like VFX changes