[nailer]

Because they're aware of what tech can and can't do. Not the grandparent, but it's right there in the post you're replying to.

[wingerlang]

I read the "ideas" as having the business ideas, not the implementation detail ideas.

[nailer]

The implementation possibilities limit or expand the product idea.

Also the implementation is the product, and the product is most of the business. They are not separate things.