The last review gives the impression that ID and DE are lately "Fused" to one. This is the dangerous position that many companies have adopted. By eliminating DE (not tooling engineer) you have created a hybrid creature that is half able of delivering a finished product.
ID is an industrial artist it is not a product designer. The contribute of the ID on the design process is anything but engineering. Therefore an ID with some engineering knowledge will only design a half finished design.
If the author of this article takes as example the draft angles I don't think he means just that. For a product to be designed properly is needed not just draft angles but many other particular features that only an engineer may address during the product design process.
This mindset is the cause of catastrophe of many organizations that the new product design is left on the hands of the hybrids like the last reviewer.