(Stam, I dislike the word "trimming" because it evokes images of Beis Shmuel people, whom I do not wish to emulate.)
View your beard as a field of grass. The natural, Chassidish beard is like an untamed prairie: nice, but wild.
A trimmed beard is like a well mown lawn: also nice, but under control.
The picked beard is like a lawn in which an amnesiac squirrel has buried his acorns: here it's long; there it's short. And everywhere, it's a mess.
So much for aesthetics. Now onto morality.
A beard picker says, "I don't want to have a beard. But my scruples don't allow my to cut it off. Oh! What a surprise! It seems that half of my beard is missing. Oh, what a nasty habit I've developed. Oh well. At least I look handsome. And don't blame me for not having a beard. It's just a habit! I've got no self-control."
The beard snipper says, "If I'm not gonna have a beard, I'm not gonna have a beard. No use avoiding the blame or pretending that I'm all holy."
Who is in control of his actions? Who's more upright and emesdik? The guy who doesn't follow his scruples or the guy who doesn't have the scruple in the first place? To paraphrase TRS' favorite haftarah, it's better to go to Baal than to jump on both posts.
Now for halacha:
There are two issues with beard cutting: "lo silbash" and "lo sashchis es pe'as zekanecha." The first issue applies equally to picking and to cutting and need not concern us now. Let us focus on the second. The Torah tells us not to "destroy" our beards. Cutting is not destroying. Picking is. Cutting leaves over some serious stubble. Picking leaveth not anything. So in order to assuage their guilty consciences, these pickers transgress a more serious prohibition "abi" to convince themselves that they're scrupulous young men.
Evil. Evil. Evil.