Speculation is never a given, but in your opinion speculation that doesn’t align with your views is to be simply dismissed as impossible. Recognizing the difference is called ‘nuance’.

And guess what, if you presumably describing what your favorite ‘actual experts’ are saying is handwaving, the logical explanation is that the thing you are describing is handwaving. Which, if you can look critically at the ‘actual experts’ really is quite a fair description of most of what they do.

Pretending the problems with your “solution” don’t exist and dismissing them as speculation or similar basic, hollow invalid reasoning, that is handwaving.