A bass doesn't "require" four strings, although having four or more does make the design work better.
More seriously: IME Schallers are extremely unreliable... and that's not just my experience: bandmates of mine have experienced failures with them, too. So, as far as I'm concerned, they DO require Loctite.
Given that I've had zero problems with Dunlops in the 10 years I've been using them, I won't ever bother with the Schaller/Loctite solution.
Nah. not "extremely" unreliable. Just unreliable!

Fact is I have basses with BOTH types. Although Dunlops are my "standard" lock (blame Carvin as it's what they sold when I got my first set of locks and that put me on that road).
However, I do have a couple of basses with Schallers. And my experience is that the darn Schallers DO come apart and unscrew. Locktite IS the fix.
However, Dunlop doesn't get off scott free either. They have a bad habit of appearing locked when they are only partially locked and the bass suddenly comes loose. The bottom line there is to apply a thin coat of lithium grease to the ball-bearing locking parts.
So my bottom line is that if you "require" (heh!) loctite for schallers and lithium grease for Dunlops they both are EXCELLENT gadgets that I wouldn't want to live without. Going back to standard straps (without beer washers) is something that really is "extremely unreliable"!

