@JS87, yes quite.
Also, many organisations do count seasonal flu as preventable, such as the European Centre for Disease Prevention and Control (See website). No virus tends to be fully preventable across the world, certain groups, those with immunity issues related to illness or treatment (chemo etc), or relating to age, pregnancy, malnutrition are going to be more likely to pick it up. The issue isn’t whether it will disappear off the face of the earth (I don’t think a large number of people believe that at all) but whether it can be made preventable enough (reduction in serious effects, higher numbers immune to it that not, most common strains of year avoidable etc). We are likely to always have some covid sufferers in hospital at some point in the year, as we do flu and other viral illnesses, but to have huge numbers of them in ITU isn’t manageable, so we have to initially take precautions to prevent that whilst working on a longer term solution.
The rules factor in capitalism, protecting the economy and other government interests alongside science and were given by Johnson, so no, they’re not the best and they don’t all make full sense, that will be similar in all countries as governments look through their own coloured glasses at the issue. However, there is science behind them, though it’s not always clear or agreed upon. Some restrictions are necessary and these aren’t the most severe we could see, in many cases it’s the lenient ones that have little evidence eg. Schools where children gather in bubbles that are too big to be counted as bubbles, do not wear masks or social distance. Equally, some are poorly phrased, like the rule of 6 and cause greater confusion down to the UK being unable to agree on who counts within that (Eg. I pop to visit my parents in england and my ds counts. They come to visit me in Wales and he does not. Nb - we’re not actually visiting, but example). This all means some restrictions have very silly elements or take very priority that could be well argued against, but in general restrictions are based around preventing spread which is useful and needed, even if the methodology and phrasing is sometimes bonkers.