Pretty much, the outliers issue could turn into serious numbers though as case rates rise. The double vaxxed are unlikely to infect each other, so infection chains should get blocked. However, with high case rates, the chances of meeting someone who has it are high, and with a third of the population unvaxxed, there are plenty of opportunities for the virus to spread, including to the vaxxed or unable to be vaxxed groups.
Unfortunately it's not really about, "just don't go to busy clubs/pubs then." People go home again after a night out and go to work the next day. Public transport can be an unavoidable risk. The multi-generation family holiday or birthday party becomes a high risk activity. The hope is that people will self regulate and there are signs of that in some of the local outbreaks, but it's going to be a stressful time and dangerous for some (including some who don't think they're in danger).