

Literal dictionary definition of a BIOS:
Note the part regarding enabling a computer to start the OS. But regardless, this point is largely moot as we are just arguing semantics.
No the PS4 doesn’t run a PC-style AMI/Phoenix BIOS, but instead a secure chain of Boot ROM to bootloaders - however, so do Macs, which are PCs.
Dumps of these console boot ROMs and loaders - at least in emulation circles - tend to be colloquially referred to as a BIOS, as it constitutes a System that handles Basic Input and Output.
It even putting this one point aside, it runs an AMD-designed x86-64 APU, that was available to purchase for PCs (AM1 socket) albeit with a reduced power GPU.
It runs GDDR5 unified memory like a modern iMac, or Steam Deck.
It natively runs a UNIX-derived OS, again like an iMac, or Linux on the Steam Deck.
Let’s just face facts, the PS4 & 5 are just iMacs in drag 😉
We don’t even need to imagine, necessarily! The quality of games released towards the tail-end of its life cycle speaks volumes: Uncharted 2&3, The Last of Us, God of War 3, Metal Gear Solid 4 etc.
I don’t think there was anything actually wrong with the architecture per se, but rather just the lack of proper documentation and tools set potential developers back significantly.
It was definitely hubris on Sony’s part, thinking that they could do whatever they wanted given the prior success of both the PlayStation and PS2 consoles prior.
Those PS3 launch stumbles definitely were a wake-up call, however I do believe that because it was largely the US/Western arm of SCEI that lead the ‘rescue’ - they ended up wrestling control away from the JP arm, ultimately causing the PS4/5 to end up so risk adverse and largely unremarkable as a result.