I don;t lower until it goes above 40 because generally below that my children are still up playing and reasonably happy. They run high temps.
I do give calpol for pain- so will give for say toothache. I have no problem at all with giviing paracetamol for pain. That link says the aim is not to remove fever, but to lower it. That's what we do.
If I give calpol both ds1 and ds3 react badly to the sweetners in them (even the non sugar free one has stuff they react to), so I don;t see the point in bringing down a temp of 39 when they're up playing, reasonably well, and having the fever do a bit of infection fighting as well. Why go through the next few days of bloody sweetner withdrawal hell without good reason.
I also limit it - and this is the major reason for me because it has been hypothesised that routine supression of fever may be linked to autism I don;t think its much more than a hypothesis at the moment. However I do know that ds2 and ds3 are over 100 times more likely than Joe Public to develop autism (well ds2 is prob ok now, but ds3 is still at risk), so I only give a potential trigger with good reason. For me a temp of plus 40 is a good reason (and anyway seizures etc are not exactly good if you are at increased autism risk). An up and about child with a low grade fever is not. For me, for my family, with an increased risk of autism.
BTW ds3 had his seizure when he had been receiving regular doses of calpol and nurofen.