Ditto to Dew.
In the old days (1980s), it was true that a beach pulse would get deeper than any standard discriminator of that era. But in recent years, that gap has been nearly closed. With machines live the Sov. Gt, CTX, CZ6, Explorers, Excal, etc....
And to the extent that .... yes, there are some beach pulses that admittedly can go deeper than standard discriminators, you have to ask yourself: "at what price?" Maybe it's because I'm primarily a beach storm erosion hunter. And when conditions are going off, then the LAST THING you need is "more depth". Time becomes of the essence (to dig as many signals as you can before the tide chases you back out). So the last thing I want to be doing, is digging nails (or spending all my time 2nd-guessing signals). Yes it's true that you can cut nastier minerals, and yes you can go deeper on tinsel thin chains, etc... but you can be hating life if you find yourself on a beach where nails-abound. Which is oft-times true if erosion has brought hundreds of targets to the surface, and depth is no longer the name-of-the-game.
In fact, if I was on eroded beaches where 1 ft. or more of depth was required to reach the targets, that's the time I would NOT be detecting that beach, in the first place. I would look for beaches where the erosion has left the targets easy to get. Because that takes a lot of time and energy to try to dig 100 targets at a foot deep each.
Yes they have their place, but ..... the devil can be in the details. I've seen guys with pulse machines chased off of red-hot beaches, where the rest of us were digging conductive signals as fast we could.