After talking with the SuiteScript team at SuiteWorld, I've dropped all 1.0 training from my curriculum. Despite 2.0's quirks and outright problems, NetSuite is treating 1.0 as a liability, and it will only become riskier as less and less new features support 1.0 (e.g. SDF, Map/Reduce). But, if 1.0 works for you, and fits your risk profile, then who am I to say anything