This isn't the case at all. In feudal times, Kings absolutely would go from town to town to recruit their levies. As an example. King Harold, prior the battle at Stamford Bridge, recruited his army on the way to the battle. This was generally how most levies were recruited. "At this time King Harold was in
Southern England, anticipating an invasion from France by
William, Duke of Normandy, another contender for the English throne. Learning of the Norwegian invasion he headed north at great speed with his
huscarls and as many thegns as he could gather, travelling day and night. "
Imperial recruitment for the byzantine empire was considerably different. The byzantines used the theme system which used a type of militia system of permanent soldiers that were trained.
"The term
thema was ambiguous, referring both to a form of military tenure and to an administrative division. A theme was an arrangement of plots of land given for farming to the soldiers. The soldiers were still technically a military unit, under the command of a
strategos, and they did not own the land they worked as it was still controlled by the state. Therefore, for its use the soldiers' pay was reduced. By accepting this proposition, the participants agreed that their descendants would also serve in the military and work in a theme, thus simultaneously reducing the need for unpopular
conscription as well as cheaply maintaining the military. It also allowed for the settling of conquered lands, as there was always a substantial addition made to public lands during a conquest. "