I mean, not having the SVE do not make them run all the workload of P cores, and this is what I said already? They are not of course different ISAs at the core, but they're not the same cores per se. When you are missing extensions, you can't address these cores when there are these instructions present. Forcing it, would kill your application with an illegal instruction error.

So heavy computational stuff is not the target of E cores, you need P cores for that.