Reading through ASME Y14-5 I noticed a Note in para 2.6 "NOTE: When basic dimensions are used, there is no accumulation of tolerances. A geometric tolerance is required to create the tolerance zone. In this case, the style of dimensioning (chain, baseline, direct) is up to the discretion of the user. Locating features using directly toleranced dimensions is not recommended".
What does this mean? Aren't direct tolerances the best compared to to chain, or baseline? So why wouldn't someone want to locate a feature using a directly toleranced dimension, unless this has something to do with using a GD&T block (I'm self-learning GD&T at the moment, so I haven't gotten to those symbols yet).