Any dev releasing a game without support will get negative blowback.
Will it? By who? That 0.001% of userbase that is the angry fanboys on the internet who call everyone "lazy devs" whenever something doesn't go the way they wanted? The rest of average Joes, which is the whole majority of PS5 audience, simply won't bother, nor they care to begin with, it's not something they will die for whether it's there or not, they will buy PS5 regardless and keep buying games on it whether the features are implemented or not. Fifa, CoD etc. will continue to sell in millions of copies each year even if they'll have just a standard stereo sound and no controller rumble at all, and people will enjoy the games perfectly fine, the same way all PC gamers out there do since forever without any of the gimmicks and buzzwords the consoles are trying to sell, that's just the way the cookie crumbles, because at the end of the day it all comes down to the games, what's happening on the screen, that's where peoples whole focus is, and everything else is just an irrelevant bonus, all of the features Sony is marketing are a nice additions, but nevertheless, unnecessary ones. Let me put it this way - if current generation could be so damn successful without any of those, so can the next upcoming generation, and no one would even notice.
You're the naive one I'm afraid. You're confusing a company like MS with individual and independent game studios.
There are an enormous number of examples where people chose to work at jobs that didn't make them the money they deserved and yet they did it anyway.
And there are plenty of examples of companies that got rich off the back of that motivation.
Haptics are cheap and simple to implement and one of the few next gen elements of the coming consoles.
Dualsense will be supported and MS will produce their own copy in time.
We will see, only time will tell, but I didn't saw those "independent game studios" supporting touchpad on DS4, or sixaxis on DS3, some even actually patched their games to allow to turn it off, and I do mean 1st party devs, so again, the history is on my side, while you're living a dream hoping that this time around it will all be different and the dream will be finally realized, while in the meantime, we're starting to hear/read how tough is it for the devs to make 8 different versions of their games, plus the whole Covid and working from home situation making everything even worse on top of it, so I honestly don't think they will want to put even more additional effort to just one of them, unless Sony puts some money for it.
Would you describe the jump from mono to stereo as a gimmick? How about stereo to surround? 3D audio is just a natural evolution in audio fidelity tech, and not supporting it would be like the industry not supporting higher fidelity video tech like 4K or HDR.
Similarly, haptic feedback is simply a higher fidelity version of the rumble tech we all know, and if rumble had been a gimmick it wouldn't have been supported by practically every console game for over 20 years.
The majority of people around the globe stopped at stereo sound, sorry to break it up to you. As per the discussion in the other audio-related thread, sadly everything above 5.1 setup is basically non-existent, not supported, whether in games, movies or whatever, so while the technological progression is indeed there, the industry has no choice but to adjust to the market, to the consumers, where the money is, and the reality is most people on the planed don't use anything more than the TV's build-in speakers, which they are totally fine with. Not to mention, Sony's 3D audio will at least initially be implemented only for the headphones, and people who don't want to wear them simply won't buy them just because Sony wants them to. And just as in my above answer, devs currently have to make their games work on 8 different platforms, so I don't think we will see Sony's proprietary solutions being implemented in many games.