It still all comes down to.. Are you OK w shortcuts for the project at hand ?
For some stuff the cheap ones are good enough.
If you're cleaning up the rats nest behind your TV, good enough.
Winding up to shorten your phone charger cord, good enough.
Keeping backup low volt various cables and wall warts in a bin without tangling,.. good enough.
But - It would betcha on critical projects... Aircraft, Military, NASA, Nu ke lar weapons, , high end projects... Betcha your Bippy the original stainless toothed Ty Rap is used.
So Ya, that's why I "bother" to keep both.
It would be wasting $ to blow through my backstock of T&B on short term silly stuff.
And Ya, Black if exposed to UV.
T & B is not a company that makes ****.
Just like drill bits... you can buy HF... or you can buy some made in historically the NE quadrant of the USA.
Machinists will know better than me... I'm mostly Wood stuff... but some years back I bought a IIRC "Chicago Latrobe" 5/8" standard HSS twist drill bit... gave me 300 + holes in 1/2" steel, and still going strong.
Marc