Contingent staking offers the protocol the ability to be compliant with the current regulations which forbid many jurisdictions from doing business with sanctioned countries and persons. Failure to add this ability runs a very real risk that Cardano staking will be considered per se in violation of existing rules, and any argument of 'but it's software' will not fly as agencies and govts will say that the fundamental design of the protocol is illegal and thus Cardano as a whole will be injured.