I heard it argued that Germany didn't have the raw resources and production capacity to go for quantity. Especially later in the war. So quality it was.
Not really, the tanks were both inefficient to operate and inefficient to build (lack of standardization, constantly changing plans, have to redesign every single part..)
That's not true. They could have standardized on a few rugged platforms -- and in fact, some in Nazi Germany advocated for that -- but their industry and engineering were generally self-sabotaging and a mess.
Except that the "quality" of their tanks was not exactly top notch, worse they used a lot of resources. At that point it was just a desperate gamble: "if we can make an invincible tank, then it won't matter how few we have", we both know it did not pay off, not even close.