Obviously, there are a lot of benefits to having a simpler plan.
Even with registration by default, though, there would need to be conditions and thresholds in place. For example, the British Columbia regime talks about how they do registration by default, but even in those cases, small businesses with fewer than six employees are exempt from the registration requirement.
Even with registration by default, exceptions and conditions would still need to be put in place so that the system doesn't become so burdensome that the one person who very occasionally is in contact with a public office holder needs to register in the system and has to take on that additional burden.