When first proposed there was opposition from businesses citing extra admin/labour costs (photo ID is also required, phone numbers must be recorded for contact tracing). Pub owners too were upset at the prospect of refusing entry to long-standing customers, particularly in rural areas where those customers would also be neighbours. But it all settled down when it was clear there were o options/alternatives available for re-opening businesses that had been closed for over 500 days.
Some objections from the public. Older persons who do not have smart phones, for example. This was remedied by allowing hard copy Vaccine Certs plus Photo ID. But objections have been relatively muted. Among the older age cohorts here, vaccine uptake has been <90%.
You have more rational people. Half the country here is brainwashed and insane.

