Noted, so no "dual sourcing."
But ALL of those costs are sunk costs and no longer relevant as the first 400k+ Model 3's had frunk hooks installed. To stop installing them now is beyond petty, for something that was actually a "surprise and delight" item.
Elon's a smart guy, and a "nanomanager" so I'm boggled that he would just let this item, and the frunk mat, get removed without his approval--and by all measures it's coming across as a daft move on Tesla's part.
The hooks could pop back up though in a month or so, we don't know the reason why this batch of cars don't have hooks.
I love my Model 3, but this is also a car company that has issues getting spoilers to people who purchased that package and forgets badges on vehicles quite often.
Now, again this is my hypothesis on these hooks, but they are hopefully being run on at least a 4 cavity 2Lx2R mold for cost and efficiencies. The thing is, they also could have purchased a cheaper 2 cavity (1Lx1R) mold - maybe as low as $50k if from China with cheap steel. Tool life either way usually 400-500k shots on a quality tool made with good steel (or lower If cheap steel), and depending on resin type. If Tesla went with the cheaper mold with some abrasive glass filled resin, it is possible that tool just hit end of life recently and started having problems. So they could either be in the process of getting a new mold made and approved, or they just decided not to bother with a replacement (and additional cap ex).
As for a potential cost savings, well if they were being run on a 1x1 mold - the piece cost is likely around $1.00-1.50 each, depending on material/density/cycle time and how much profit their supplier is taking. Eliminating these from the vehicle if at end of tooling life would save them bare minimum $2-3/ vehicle plus the cost of new tooling (and labor cost to assemble).That adds up pretty quick.