I thought the example of using a DSL to get as close to the mindset of the customer as possible was a good concrete example.
I think it was also pointed out that even with this DSL, there was still communication errors. However, it seemed easier to fix the misunderstandings because there was a DSL there to fall back on.
> I thought the example of using a DSL to get as close to the mindset of the customer as possible was a good concrete example.
No, "concrete" means that it's something real and tangible. Not just "a DSL" and "a customer", but "a language for the control of a nuclear power plant" and "General Electric" or something like that. Well, a specific company name is not so important, but the industry and what the language's scope was seem extremely relevant to me.
Without actually providing an example, you have no idea what level of abstraction they're working at, and what kinds of benefits and limitations the DSL may have.
I think it was also pointed out that even with this DSL, there was still communication errors. However, it seemed easier to fix the misunderstandings because there was a DSL there to fall back on.