 As mentioned above  (§7.2),  contextuality can be construed as a form of fine tuning (Cavalcanti 2018), especially when the demand for noncontextuality is understood as a requirement of parsimony, as above. The worries raised in this section and the last underline the fact that the challenge to account for various types of fine tuning is the most serious principled obstacle that retrocausal accounts continue to face.