Your assumption is everyone will follow that rules which is how we know now is not true. There always will be deniers and rule breakers, so even a very rigorous policy will not work as intended to stop the spread completely. Even not every country will follow those rules - look at today's Switzerland where ski resorts are open right now and full with tourists from neighboring countries.
No, I don't assume everyone will follow the rules. But if more people would follow the rules with a bit of discipline, things would be much better. As shown in Asian countries, which mostly don't have a Covid-19 problem. My list wasn't meant as preventing Covid-19 or similar diseases completely, but like things we can do to make the next pandemic a lesser problem in those months during which we wait for the vaccine. Not as a replacement for a vaccine, which always will the the one long-term solution to a pandemic.
One more thing towards rules: it really depends on a society agreeing. Like most societies agree that people should wear pants on the street, woman even shirts. There might be people breaking these rules, but overall society managed to make this a very infrequent thing.
> But if more people would follow the rules with a bit of discipline, things would be much better. As shown in Asian countries, which mostly don't have a Covid-19 problem
How do you know they have less case because people follow the rules ? I have been in Cambodia and Thailand and people don't really follow the rules there and there is barely any case
