Many of these comments highlight that this FINRA request has as much to do with the rise of "retail" investors as it does with "complex products" (whatever that would ultimately mean). The proposals in FINRA's request would fundamentally transform securities regulation: from a disclosure-based regime to a regulator-determined merit-based one; and from one where broker-dealer interactions with investors are regulated to one where, in effect, investors themselves are regulated.
As many noted, at minimum, any such foundational changes by FINRA and the SEC should only be effected through the traditional notice and comment rulemaking process.