The fact that it isn't is largely down to good-if-not-quite-OMSI-standard physics, and varied road layouts and scenery. Spending 90 minutes ferrying a tank of propane from Sheffield to Prague could (should?) be tedious.
this is Eddie Stobart: The Game in all but name. Contract perusing, truck pimping, skill upgrading, driver hiring. Slowly (or rapidly if you go to a bank) you amass the funds to buy your first rig and rent your first yard.
You start as a low-skilled, truckless lorry jockey, forced to take work from established haulage companies.