>>"Domain knowledge can be learnt much quicker than how to apply good engineering principles."
I'm not sure that's universally true. Good software engineers who are arrogant about easily acquired domain knowledge have been the downfall of many an ERP system.
There's SO much IT that's literally all about putting business rules into the system.
> Good software engineers who are arrogant about easily acquired domain knowledge
This is a problem of arrogance, not of domain expertise.
Having worked in a few different industries, I'd wager that for the vast majority of them, a competent person can probably learn 80% of the required domain knowledge in under 6 months. For the latter 20%, as long as the person is not arrogant, they will seek help from colleagues who have been around for longer.
On the other hand, solid engineering principles will take 10-15 years of actually experimenting and learning in practice what makes a system resilient and durable.
"The first 80% is easy... it's the second 80% that gets you."