It does make a difference if enforced properly.
Germany made FFP2 masks compulsory in February, and Covid passports became compulsory in March. That was over 7 months ago. Right when the third wave was starting to develop here.
They do work. Less than 10% of the population was vaccinated in March, and what we saw was a steady decline in cases and a much lower peak of the wave than all the neighbouring countries. When Europe was panicking about the Indian variant (was that Delta? I lose track), Germany was reopening restaurants.
Why? Because it had come up with measures that proved to work when applied properly.
My colleagues in the UK still work with restrictions around numbers and distancing, in a job that's not practical to be done that way (performing arts).
My peers in UK universities are still having online lectures. 20 months after Covid appeared
In the meantime, students here have in-person classes and we see our main tutors face-to-face, every single week. That's for a postgraduate 'not-so-important' degree, undergrads are having it even more normal than us.
The cases have been holding steady for over two months now. There are no talks of lockdowns over winter because people behave responsibly and the government and healthcare systems prepare accordingly for the colder season.