1. After 20 seconds of consecutive attacks, you've saved roughly 0.016 seconds. If you have to run into a conflag or whatever, you have a 0.016 / 2.46 = 0.7% chance to get an extra full GCD off before freezing. After 40 seconds, that chance increases to 1.3%. And that's from ... "2" SS.

2. It's not like crit is much better. 2 points of CRT is something like 0.14% chance for +50% damage.

3. SS is still our worst stat, but it has value.

In any case, stat weights aren't really there to try to make a decision for you on "2" of any offstat. Hell you can't even choose "2" skill speed. If you want to manually micromanage every gear decision per your own specific breakpoints (e.g. 42 SS is only worth "40" SS to you ... ??), that's fine. The stat weights are there to guide a gearing strategy where you are comparing 15-30 chunks of different secondary stats.