You don't say what you mean by appropriate testing, but in the context of this thread it probably means widespread free at the point of use testing available to the public? And we already know that this plus masks didn't curb the Omicron wave, so it's essentially advocacy for something that hasn't worked. This is very important given the costs of the tests.
The Omicron variant is very infectious, but would have had a far higher peak without isolation and masks, so no, you are wrong to say that these measures have done nothing to curb omicron. Now numbers are increasing again and the government is playing its ‘nothing to see here’ game while schools and hospitals struggle. Even if everyone eventually catches Covid multiple times, infection rates matter.
There is no particular reason to believe that future variants will be milder.
In the short term appropriate testing certainly means more tests available for people in regular contact with people who are vulnerable, regardless of their income.
Whether universal free testing is required is another question, but the government has decided Covid is over, so testing can’t be discussed at all. Instead we have to waste time pointing out why their Rwanda scheme is bat shit crazy.
Meanwhile it’s very worrying when ministers talk about being the first country to make Covid endemic, as though that is within their control, or as though endemic diseases are harmless and require no restrictions or action.