"Weld me a functional cartridge with triple the data"
Well, you wouldn't be "welding", that's for sure. And I highly doubt you can do anything of the sort. That much is obvious by your terminology.
Also, some consoles also had a limit to the size capacity of any game. Genesis games I think max out at 8MB. Genesis rom hacks that are larger than 8MB, have to be played on a special emulator. I'm not sure if other systems had these limits.
You also say "false" to storage being more expensive in the late 80's / 90's. You obviously do not belong on this board, because if you were older, you would know that it's only recently, within the last 5-10 years or so, that storage space has become cheap and ubiquitous. Keeping costs down was one motivating factor for cartridges to be smaller / have less capacity. ONE factor or probably many. Also for example.. if you take a 2TB hard drive, and try to stick it into a really old operating system, the old OS is not going to be able recognize and utilize all of that space. I'm sure the same held true for various older, more primitive consoles.
Please, go back to /v/. You do not belong here.