It'd be a dream if SE treated KH at the same level as FFXV xDI just want to note that the way SE markets KH is not the same as how they marketed FFXV. Comparisons can’t really be drawn between the two.
But honestly, FFXV had a lot to prove, and the Lumimous Engine team knew they had a lot to prove (and had the DLC qualifications chosen provided before launch) but Kingdom Hearts has had this known for over a decade now.
Honestly, we need to look at the Final Mixes and be THANKFUL that we aren't stuck in that time period. I feel that new members don't realise that us long term fans had to wait over a decade to get additional material for the game. Three months since E3 is nothing compared since the 12 years since KHII.5 and longer since KH1.5