I don’t know enough about the subjects to go into details, but I know enough to say that that is reductive. ARM/alternatives are not inherently better, at least not universally. And, especially because of the inertia, I do not expect x86 to be fully replaced on the desktop any time soon. The motivations behind companies such as Apple using ARM likely have more to do with licensing than anything else

It’s probably more useful to think of x86 and ARM as slightly different tools that are slightly better suited to different tasks. Desktop, server (and possibly high-performance) computing are x86’s specialty, and I do not expect it to be replaced

All-in-all, from what I know, the practical differences between ARM and x86 are nowhere near large enough to be compared to something like the electric vs internal combustion engine. It’s probably closer to a difference of, say, a typical train and a subway

But, please read up on this yourself. I am not an expert in hardware, this is just what i casually picked up as a layperson