Only bona fide hit in your list is GOW.
They should hire indie studios to work on their less popular IP and make it multi platform to negate risk.
For example Supergiant Games can basically use the Hades engine to make a cheap reskin retro GOW game. So people can play on the Switch and iPhone. ditto.
I kind of agree with you on them working with smaller 3P teams to take on those type of IP. Do something like Sega has with SoR4 and Sonic Mania, for example.
However I disagree they need to make them multiplatform to negate risk. More specifically, multi-console. I think some of those games would be made with mobile in mind but also available for PS consoles, maybe some as digital purchases, maybe even a few as inclusions into PS+ as Day 1 releases.
But what is necessarily the point in bringing those games to Switch or Xbox? I can't think of any. PS4/PS5/mobile would be enough and maybe do compilations for down-the-road releases on Steam or something like that.
Supporting SEGA back then might have helped having more arcade games today.
It would've (and I'd definitely prefer a market with them as a platform holder than one without), but it might have also helped if Sega didn't cannibalize themselves with idiotic business decisions that ate away at their core fanbase and customer confidence
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I wouldnt mind seeing Sony invest in games similar to these...
But seems this gen they are much more interested in cinematic western games.
I mean they kinda are still? They have at least three games now through the China Hero Project, hopefully they're doing something with Black Myth Wukong and (while not Chinese) DokeV.
Internally, supposedly Pixelpous is making some type of AAA platforming-style game (IIRC), we also need to see what Team Asobi (which still has a lot of Japan Studio alumni) is up to at some point. Sony have definitely scaled back on some of the quirkier style of non-cinematic games that would've been nice to see persist, that's for sure, but so have quite a lot of big Japanese and Western publishers, so I don't get why the derision is always seemingly directed at just Sony.
It's also not like they have 100% ditched those games to focus on just cinematic 3P action-adventure AAA games. They have Returnal, GT7, R&C: Rift Apart, Demon's Souls Remake (it doesn't fit the cinematic profile of something like a TLOU or Uncharted), Astro's Playroom etc. and that's all from just the past two years alone. Again, though, yes they could be doing more with some of the quirkier legacy IP or with a bit more genre variety.
I'd personally love a new Parappa/UmJammer, Tomba! and maybe a new Jet Moto expanding on that formula (maybe they can make it their type of arcade racer that doesn't have too much bleed-over into GT series since it's not using cars), either with partnered 3P studios or 1P teams. But I still acknowledge the games they make which aren't just GOWR, HFW etc.