But they have complete control over the things that really matter to people outside of the economy, and to many people the really important matters such as education, healthcare, social care, foreign policy, security and constitutional matters.
Equally I would argue that the macro-economic policies matter hugely too, they enable or make difficult most of the economic activity you are talking about.
To me it is the fundamental dishonesty of saying that the opposition party has an appalling economic record (when it did not) and that ruling party has an excellent economic record (which it doesn't) that I am trying to highlight here.
Again though, I'd suggest that control has severe limitations. The NHS for instance, largely take an interest in our health only when we become sick. There is very little involvement in actually keeping us healthy, which is really what healthcare should be about. The state have very little say in how we eat/drink, how much we exercise and so on.
Likewise with education. I know it'd be nice to think that we only learn things in the classroom, but if you asked most adults, I would certainly hope to hear that they've learned an awful lot more outside of the classroom than they ever have inside of it. If schools focused on providing people with a love of learning and the skills to do it throughout their life then I'd agree that they are hugely influential, but in reality most are just there to give people certain facts, and the usefulness of those facts is often very limited.
Re the dishonesty bit, they're politicians, dishonesty is kind of par for the course isn't it? Especially with an election looming

All of the parties will be trying to spin and dodge over the next few months to try and paint themselves in as good a light as possible, and the rest in as bad a light as possible.