I wonder if some of the problems leading to insufficient liquidity allocation are:
  1. that Bitcoin currently self-generates "yield" in USD terms merely hodling it
  2. there's the perception that you can't generate meaningful yield on lightning yet
  3. a lot of folks using lightning are hobbyists and earn yield in a non-monetary way (wow the future is cool feelings) so aren't motivated to seek monetary yield
P.S. Roy really knows how to communicate well - the metaphors were top notch.