I think it could also be useful for nylon strings in 1a, particularly the ones designed to be long lasting. These strings are super strong and resistant to wear, but also very slippery.
Very much this. Some are downright soapy slick and the normal way never stayed put with them. Angel hair particularly hated the typical loop-tie method.
Toxic dragons are another good example of a string that likes special treatment. The trade off is insane long life and snug, secure, minimal, and perfect knot placement for least digging or distraction.