>>I don’t want a military grade mixer in my kitchen if getting a broken whisk or motor on it is going to require me hunting all over

This is extremely unlikely - military/industrial-grade stuff is designed for heavy duty cycles and decades of use. It is extremely unlikely that you'd see it even hiccup in decades of consumer use.

If you did need a part, the mfgr will have it, because, unlike consumer crap, these products have lifetimes measured in decades, not quarters.

>> is going to suck to make high end pastries because it’s geared towards making mashed potatoes for the troops

not unless you have some specialty unit. And if that is the case, get the industrial version designed for chefs to make industrial quantities of high-grade pastries