We can take his word, which may well be on the mark. Or...
In my experience, ’dealers’ come in all types but they do have this common wonderful ability to sniff out and react to those that are wasting their time.
With respect to the OP’s query, I suggest reading up on the myriad threads related to DACs to find your answer(s).
As stated:
I’m looking for other’s opinions on whether it might make a dramatic difference over my present system.
No one but the OP can address this.