I don't think you and he are in disagreement. Obviously you should do what will give your business an advantage. He is just saying that it is easy to think that

I don't think you and he are in disagreement. Obviously you should do what will give your business an advantage. He is just saying that it is easy to think that certain new technologies will give you an advantage, but then realize later that what they cost you in bugs/complexity/maintainability etc. make it not worth it for the business. So it's usually better to go with tech that is tried and tested rather than always reaching for the latest new thing.