Lots of opinions and different ways to hunt.
The biggest thing that determines HOW I hunt with my detector is WHERE I hunt and the local CONDITIONS.
Over the years, I have preferred hunting the yards around private homes. Most of these homes are occupied, have a yard with grass and the like and an owner that doesn't want a mess made of it. Also, I usually have a limited amount of time to hunt and I may not be able to return anytime soon. Meaning to me, I need to make the most of my time. I have found that having a meter is helpful for me, not just to give me a rough idea of what I may have my coil over, but how deep the target is as well. Efficiency requires me to do some discrimination, use my best judgement. And as was mentioned above, a target ID reading is just that, a reference number, nothing more. As you experienced hunters know, with target ID there is no 'sure thing'.
Make of it what you will . If I decide NOT to dig up readings in the round and square tab range where I live, I have the very real possibility of leaving behind brass and aluminum (aluminium to our friends overseas) trade tokens, which I personally like finding and can be very valuable. The variety of sizes and shapes of these tokens is enormous and there isn't a reasonable way to go thru and determine target ID readings for all of them vs. the varieties of round and square tabs, which may or may not be bent, cut to a partial by a lawn mower, etc.
When I decide to go out and hunt some of the ghost towns in the west desert of Utah, I have to use a completely different approach. The alkali soil causes a lot of corrosion on coins of all types, there is a lot of corroded iron all over the place. In places like this, we are looking at iron and then everything else. I find a target ID meter of any type not very helpful. I have a shovel, I search for signals of most any type and dig them. I've had some very 'low' readings end up being silver coins and most of the readings are not clear and clean by any means. I would suspect this is the same for relic hunters all over the world.
Relic hunting in a ghost town and coin hunting in parks and ring hunting on beaches are all very different types of hunting. Sure, I can follow the Beep - Dig mentality everywhere I go, but it may not be the best way to approach an area or be the most productive. Conversely, how many times have I dug up a weird signal that didn't sound or ID right, but made me curious enough to dig it and it turned up to be something REALLY GOOD?
Beginners are especially good at this, because they've not yet become biased to certain tones and they just go ahead and dig it, not knowing any better. Ha, jokes on us when they find a silver dollar 2" deep in a heavily hunted park that everybody always thought was too shallow to be anything but a soda can.
As I mentioned earlier, I like to hunt the yards around old homes. If I have an opportunity to return to an old yard, I will often go thru different stages of hunting, starting with some discrimination to optimize my time there and make things as productive as possible. If the yard is good and productive, the next few times I return, I may try to remove as much 'junk' as I can in an effort to uncover other possibly good targets that may be masked. And lastly, once the yard has really been thinned out, I will go back and hunt hard, checking out any iffy signal, hunt carefully along metal sprinkler pipes, fences and sidewalks, looking for any possible leftovers I may have missed.
Some yards that I hunt have already been hunted by others and are past the beginning and middle stages and I end up going right to the 'iffy' stage, using all of my detectors abilities plus any wiley old guy tricks I've learned over the years. I am usually not disappointed and can find good items missed or left behind by others.
I guess what I am saying is that there is a time and place for meters, discrimination, and all sorts of hunting methods based on where we are hunting, the local conditions and what we are hunting for. It doesn't make a lot of sense to leave tools in the car (so to speak) that we could be putting to use if the situation calls for it.
Best of luck out there everybody,
Rich (Utah)