First off, RoI was US$30, while TTK was US$40. Let's compare these real quick.
Well, you didn't play D2, so how can you tell it's not? Speculation I guess?
RoI was like 20$ if I remember right (maybe I'm wrong, I'm not sure)? So D2 will be like 60$, so maybe it will be 1,5 hour * 3 (like the price), so 4,5 hours? Did you count the Raid in the 1,5 hour?
Awhat they wanted to do with D1 and I'm illustrating my point with examples, in the end, saying that TTK felt more like a proper game changer than D2 seems to be.
RoI brought us 1 new playable space (The Plaguelands), nearly a third of which is reskinned old geometry (Cosmodrome Patrol). TTK gave us a fully new playable space (The Dreadnaught), but it's also the smallest of them all - hence no Sparrows. D2 is 4 completely new playable spaces, boasting significantly bigger size and wealth of activities. Jury is still out on the quality of these treasure hunt and adventure side quests, but in terms of patrol space content volume this eclipses what we got in the 4 D1 paid expansions *combined*.
We don't know how many strikes D2 is shipping with. D1 shipped with 6 (1 of which was PS exclusive). For reference, TDB gave us 2 (1 of which was PS exclusive); HoW brought 1; TTK brought us 5 (1 of which was PS exclusive); RoI brought 3 (2 of which are remixed old Strikes; it would be more honest to say we got 1 new Strike). I can't imagine D2 shipping with fewer Strikes than D1 did. Can't say for sure until confirmation obviously, but 6-9 is a reasonable guess. Meaning anywhere between what Vanilla brought and the actual sum of every other expansion.
I understand the reveal not showing what you wanted to see, or seeing that the stuff you didn't like about D1 isn't changing. I think many of the people who didn't like D1 still won't like D2 because it's largely a continuation (with improvements) of the same formula - which is what fans wanted for better or worse.
But do you really think it makes any sense comparing this to an expansion given the amount of content we're looking at? I mean once you dump the original 4 planets and switch them for 4 new, bigger ones...once you revamp the entire gear and subclass perk setup (INT/DIS/STR gone, Special/Heavy switched to Energy/Power with different focus for weapon switching, Armor Recovery Agility tied to armor instead of Class, ground-up rebalance from scratch of Class balance etc)...once you switch your Campaign vision from "be your own Legend at your own pace and in whatever order you want" which led to an incoherent incomprehensible story to a cinematic story driven narrative with cutscenes and mission dialogue...swap barren Patrols to areas with NPCs giving quests and treasure hunts and Uncharted areas to explore....
It's still recognizably Destiny (hence the name and not a new IP like some people seemed to have wanted). But it's also immediately apparent that it's a new game. Like, it may not have everything I wanted, or have stuff I didn't want, but it's still clearly a full blown sequel imo