I used to be quite keen on tractors - but not any more - I`ve become an ex-tractor fan.
However, I do agree that having followed a tractor in Wales a couple of years ago for over 30 miles, I did feel that he could have pulled in occasionally to let traffic go past. I normally assume tractors are going between farms etc. and can cope with the delay as they have an important job to do, but on long distance journeys they should pull in from time to time.
