Definitely curious but i have some thoughts.
1) The originals were a bit overrated and while people checked them out, they didnt feel compelled to buy the sequels.
2) The sequels sold faster than the originals (Spiderman 2, GOW2, HFW, TLOU2) all sold faster but then stopped selling because of PS+ and the potential for future PC releases.
3) The sequels are all samey with a very DLC feel to them.
4) PS5 has only gotten MORE expensive since launch unlike the PS4 which was selling for just $299 around this time with sales going as low as $250.
5) Games are not going on sales like they used to. A LOT of those TLOU1 and Horizon sales were when they would go on sale at around $15 on PSN. I remember buying TLOU1 remastered for just $7.99 in 2016 or 2017. been waiting to buy GT7 for 3+ years now and the lowest ive seen it go is $40. Literally bought a retail copy for $25 this one time and walmart straight up cancelled the order after saying it was a price mistake.
In short, $70 games, devaluing your games by putting them on PS+, devaluing your brand by porting everything to PC, samey sequels and expensive consoles 5 years into the gen. Console gaming is supposed to be literally subsidized by the console maker who are supposed to make money off of royalties and now subs. But sony no longer believes in selling consoles at a loss which means fewer parents buying their kids an expensive $500+ toy. It is really bad for the growth of the industry which has to fend off F2P games on mobile like fortnite, cod and robolox.