The lower graphics quality is because the GPU can’t do math. There’s no way to mitigate that.
Yes, which is why the CPU isn’t the problem. It’s the GPU.
It’s also absolutely none of the work involved in a port. The work on a port is entirely making the actual mechanics function on a CPU that was terrible for mobile years before the switch launched.
Please share a source for this. A game like MK1 doesn’t need a lot of CPU power, because there just isn’t anything complicated happening. It’s all GPU that’s missing.