So they excel at helping off lesser threats to neutralize stronger offensive options.

The Warriors advantage is that they don't have lesser offensive options. Every player is either an excellent shooter or a great passer/facilitator (and often both).

If you'll recall, one of the few moment that Mitchell looked good was when Gobert was out. Because then there weren't as many clear weak spots for Dallas to sacrifice in their team defense.

Because the entire GSW team is always moving with a purpose it means that Dallas' defense on a string (which makes up for their lack of excellent individual defenders) tends to come unraveled after a while