diablo immortal is going to make A LOT more money than elden ring, so your example is not a good one. not even in the same universe.
[1] https://www.polygon.com/23070948/elden-ring-sales-chart-npd-...
[2] https://gameworldobserver.com/2022/06/03/diablo-immortal-gen...
Until it doesn't. We're not talking about the same thing here because one is a one-time payment (license) vs on-going (loot boxes / SaaS). I'm highly critical of loot box (p2p) games, but you're on-going payments do pay for content in the future. Companies who charge once have very little incentive to maintain the software (assuming it requires it to).
Let's say ER reaches 20M + 8Mx2 for it's two upcoming DLCs @ $40 each. That's $1.8B lifetime. Pretty amazing! DI would need to make $360M per year to be an equivalent business. So 800k in the first 24 hours is not too far off track to being equivalent.
Whereas the former, despite being a good game, may not provide the revenue model desired by its stakeholders.
ER impressed me so much that I bought three earlier titles from From Software, an additional $120 spent. Regrettably, you show consumer behavior like that to a mercenary games industry exec, and they'll just see "lost opportunity to put the screws to the market" and not "we should make better games."
(This is the first time that I've literally worn out a controller playing a single game).