Well, you're entitled to your view. I've NEVER had problems with Switchcraft's TS and TRS connectors, and never broken a strain relief clamp on them. The brass MIL spec connectors are a bit of a PITA, but I get around that by soldering directly to the connectore and throwing away the little eyelet clips and screws.
I would NEVER use a Neutrik TS on a guitar cable - I've seen the strain relief let go too many times.
That has as much to do with the choice of cable as the Neutrik connectors!
Not really. I've had the same problem with Neutriks on every brand of cable I've tried. Belden (my choice for durability), Canare, Mogami, whatever. The problem is with the poorly designed strain relief, not the cable.
EDIT: If a strain relief is designed for ease of assembly it is NOT designed for durability in the field. The two are mutually exclusive.