Depends. For obscure behavior features, ok, for 'language features' I'm probably still going to pass. Because in this example case that would come down do

  # See stackoverflow/highlyupvoted/wtf/does/python/do/here
  # This is the same as (a < b) < c.
  x = a < b < c

whih is not clearer, not easier to parse and not faster to read and harder to maintain (leads to rot easily when variable names change) than the non-ambiguous other choice.