I’m sorry, but are you genuinely unaware how unhinged that all sounds?
Before I rebut your points, one by one, I'll remind you that engineers think about how things will fail.
Part of engineering is knowing how to put risk into perspective. This is a couple of thousand $ scope, not a piece of life-support equipment or spacecraft part.
Die-cast metal is used for countless products, almost always ones of above-average quality. From tripod castings, to KitchenAid mixers, to car engines, to all manner of electrical motor mounts, etc., to BBQs (like my Weber Q series, which is cast aluminum, with cast iron grills), to practically all high end camera bodies, field-use broadcast audio/video gear (stuff designed to take a spill and keep on working)… the list goes on and on!
Partly true, but completely irrelevant to the context. The highest quality ones will invariably be machined rather than cast, either from billet or forged blanks. In any case, heavy duty applications are pretty chunky, way more so than the weak point here, namely the handle pins. They will be exposed to shear forces when the scope is being carried; the examples you give are mostly exposed to impact (compression) forces, where the material is quite a bit stronger.
I'm sorry, but just... no. The examples I listed are ones where the
best products use die-cast parts. Every pro-level photo camera uses a die-cast frame. (The only pro cameras I know of that use milled billets are the RED cinema cameras, which are likely produced in a fraction of the volume of Canon, Nikon, and Sony cameras, all of which use die-cast bodies.)
The best still photo camera tripods are from Manfrotto, Gitzo, etc., and they're all die-cast. The standard in video tripods is Vinten, and they're... die-cast.
There's no better stand mixer than KitchenAid, and they are die-cast. (And so are the competitors.)
Etc etc etc.
So your claim that the best products are "invariably" (your word!) made of billet or forged blanks is, plain and simply, false.
Edit: And just to be clear: I am not a machinist or metallurgist. I am, however, familiar with enough best-in-class products that ALL use die-cast bodies to know that your blanket statement cannot, and thus is not, true.