I tried to look up, but I wanted to clarify: you can't just insert the disc and just play games on modern consoles? You always have to do some install process? Things where like that in the PS4/XB1 generation too?
Switch 1 and 2 are not like that right? (when the game is on the cart I mean)
I don't think you understand how insanely slow disc drives are...
even back on the Xbox 360, when we had super slow HDDs, installing the game would sometimes double your load speed.
Bluray loads even slower than DVD, due to the sheer data density and slower spin speed.
the drives inside current consoles read at about 40MB/s.
to fill the 13.5GB of useable RAM of the system at that speed would mean load times of around 6 minutes.
and that's without taking seeking times into account. this is the fastest speed possible. if the laser had to actually move around the disc (so if we look at a realistic scenario) instead of loading in one lane the whole time, you'd maybe reach 7min and more.
back on Xbox 360, where the disc read speed was 16MB/s and you only had to fill 512MB at most, it was still fine, because that meant like 30sec load times. if the data was super fragmented you'd get maybe closer to a minute, but that's still a far cry from the 6min minimum you'd have if you wanted to load current gen games via disc.
but even back then, the PS3 with it's super slow Bluray drive that only read half as fast as the 360's disc drive, many PS3 games forced an install in order to have decent load times on par with the 360.
games that didn't, like Mirror's Edge, had way longer loads, and even texture pop-in issues compared to the 360. which is why the best way to play Mirror's Edge on PS3 is by playing the digital version, as it loads way faster from the harddrive, and you can't install the disc version