...In a less snarky comment, mobile DID used to charge an upgrade fee, back when there were separate low-res and "HD" versions. But now, mobile isn't even in that ring of competition, they're either trying to give games away F2P or they're tying them to subscription services. Get big quick, hook the whales, that's the mobile software strategy. I can't even think of a game that has massive differences across mobile games that isn't free, most of the for-cost stuff is decade-old console stuff ported over without any MTX to fund them.
Also, in sports games, PC has so far sidestepped the $10 upgrade fee by just not being the platform where the next-gen versions launch. I don't think too many other genres of games will be released on PC that way, but for companies serious about that $10 upgrade fee being necessary to produce a product at that caliber, we may just see PC prices go up as a baseline.
And although the upgrade fee system is being challenged, it's not like it's unusual in other markets. You pay a higher price for high-definition in video (4K BDs are usually $5-10 more, and Netflix is $9 for Basic and $18 for UHD Premium), and music generally costs more for the HD dl/stream. There's not really a "next-generation" price break in professional software utilities like Premiere or Pro Tools where they charge extra for a Windows 11 version or a HD version or like a "DirectStorage-compatible" version optimized for SSDs, but there's very often a Base and Pro version that change capabilities (such as track limitations) for high-performance use. It's not a universal price hike, but it's common.
I don't like what Sony's doing, and as next-gen evolves it'll be interesting to see how prices adjust with the market, but to say it's out of step with the rest of the software industry is kind of a narrow view of the software industry.