...But we don't know anything concerning Sony's next-gen plans, so how can you say with any modicum of certainty that they have abandoned, or betrayed their supporters? Honestly, how is a 3 year old game like Horizon arriving on PC affecting PS5 , when PS5 players will inevitably be getting Horizon 2? You're treating speculation as fact, and even if the rumor turns out to be true, it's unlikely that Horizon 2 will arrive Day 1 on both PS5 and PC. More than likely, Horizon 2 will arrive at least a year after it releases on PS5, or after the game's sales have plateaued on PS5. Changes like these were hinted at, or said prior to these rumors however. MLB: The Show was the biggest indicator of an emerging ideology at Sony, but Shawn Layden also said that Sony acknowledged the failings they had with a lack of multiplayer games this generation. You don't have to look very hard to see that Fortnite, Minecraft, and other free-to-play multiplayer titles are dominating popular culture, so at the very least some of Sony's future multiplayer titles were destined to be offered to a wider demographic.
HZD has run its course on PS4, and won't sell a sizable amount more in present PS markets so it makes business sense to offer the game to a new market segment and make money near effortlessly, especially with Decima Engine being on PC soon with Death Stranding. Sony would be foolish to leave money on the table like that. PC also isn't a direct competitor to consoles, so PS5 sales aren't jeopardized so long as Sony opts not to release exclusives on PC Day 1. I think that's how Sony's strategy will differ from Microsoft's and protect their hardware business. Just think for a second, why would Sony invest billions in hardware R&D only to cripple the product of that expenditure? That strategy benefits MS because most PC gamers are Windows users, and if someone opts to forego a Xbox because they have a gaming PC or will build one, MS will still benefit because there are less inroads for them to build with all the different gaming initiatives they have available to PC players. So whatever they lose in hardware sales they'll recoup in software and player engagement with their ecosystems. The untapped market of PC gamers, who are supporters of software that have had staggered releases, helped to drive Sony to this decision. MH:W is proof-positive of that. As long as PS5 gamers get the games first for supporting that platform, and can keep their sense of superiority, I think that's all the will really matter in the end.