>Domain knowledge can be learnt much quicker than how to apply good engineering principles.
Can it? I'm of the opposite opinion. You can improve methodology much faster than gaining specialized knowledge.
You can enforce and fast-track the former because it's a matter of approach.
The latter is subject to the person's learning affinity, capacity and availability at the time and can't be forced beyond reasonable facilitation. It also builds on itself, with the corollary that there's a much steeper curve early on.
If we apply the same argument to software engineering I think it's a good point... just maybe not the one you intended to make.