I agree, I have a fully portable lifetime tracker myself at +0.59% and don't think I will ever change it because of the large premium on fixed products (see edit above). I even got ambushed in the bank the other month by someone wanting us to move to some great new fixed product, I said look across the 2 year fixed period you are offering, BoE would need to increase rates by like 5% within the next year for me to save any money, even before taking fees into account!
I think it's important to make people aware though that jumping off a tracker onto a fixed product at the current rates isn't something to take for granted though when selling the flexibility angle.