These ideas demonstrate a lack of understanding of the platform and technology. Apple integrating nvidia GPUs is just one example. On a standard bus? That would make Apple Silicons core benefits redundant and put Mac users in the same rat race for products as PC users. Some custom integration? Tried that. It means lagging by years. On top of that why? Apple Silicon means upgrades to performance faster than thenPC market. Apple has little to gain in trying to capture the high end gaming market.
Similarly developing Mac software on PCs makes no sense logistically or practically. Why would Apple want software in the market which had never been run on real Apple hardware? Why would a developer want to write for a platform they aren’t on.
This “make Macs into PCs” thing never dies. Mac diehards stay with the platform, even when they are slower or more expensive, because they aren’t PCs.