1. Monster Hunter declined as have virtually all major 3rd party games including Dragon Quest and certainly Final Fantasy, and the vast majority of A/AA games. Nintendo's first party games on the other hand kept climbing, it's an utter monopoly. Rise barely or moderately outselling World in Japan isn't really a feat when you consider portability and the massive popularity/install base gap between PS4 and Switch. MHRise will not achieve the numbers of Portable 3rd, which came out on a system not nearly as popular as the Switch. The series definitely declined in Japan despite the insane growth in the rest of the world. But thankfully the decline isn't as severe as Final Fantasy or Resident Evil or Gran Turismo, etc. It does seem to have the potential to bounce back if released on Playstation and Switch simultaneously (Dragon Quest couldn't with XI).
5. No it isn't the norm. PS3 and PS4 weren't backwards compatible. Anyone who bought the PS2/PS3 version of a certain game bought it to play it ONLY on the native console. This may not apply PS4/PS5 if my understanding of "Dumb Delivery" is correct. It looks like at least in some cases, PS4 version works on both (and most give you a free upgrade when a native PS5 version is available), whereas the PS5 version wouldn't work on PS4. In other words, PS4 versions are superior due to accessibility. In the case of Horizon 2 it's actually cheaper (PS4 version literally gives you more for less. It's ridiculous).
5. You are correct. PS5 physicals dont work on ps4. It just makes more sense to buy the PS4 physical version because it works on the PS5 too and 99% of the games so far are free upgrades. The only 2 games i know that cost $10 to upgrade are GoT and death stranding. Even with the $10 fee to upgrade, most people would still buy the PS4 version so they can play on both PS4 and PS5Last edited by Pinkie_pie - on 03 October 2021