Tom,
My whatever comment simply referred to what was going thru my mind while I typed the reply. Which is, based on all the posts I have read about it so far, the new ML's operating characteristics mirror very closely the digital Coinstrike and Excel. Call it what you want, DPA or DSP or software based, the new machines have quick reactions which makes them seem to be "busy" in their target response to a lot of folks. Throw in the old bugaboo of iron and the way they respond to it and it can be hard to adapt. Read Christopher(OH) post about his buddy that he sold his C$ to. He took to it like a duck to water and has had great success with it. Not everyone takes to a detector like that and why you see a lot of guys lamenting the passing of all the analog machines that is currently going on. There is good and bad to both. Find what works for you and hang in there.
As far as your question of why have TID if you have to dig it all, thats easy. No TID machine with todays technology can possibly be accurate all the time. Depth, mineralization, co-located targets all can throw off the ID. If you read the reports on the new machines many times guys report on whether or not it "saw" something at a pounded site. It doesn't always mean the new detector is better if it found stuff missed before, but can be an indication of its overall performance. Sometimes that find they are referring is only the slightest indication of something there that other machines missed, either because it did not have the ability or perhaps just because it is a new machine and the operator is paying close attention.
HH Tom