The Machame route is considered a challenging trek, requiring a good level of physical fitness, endurance, and mental preparation. The route involves long days of hiking, steep ascents, and rugged terrain.
A factor that contributes to the difficulty of the Machame route is the rapid altitude gain. You need to acclimatize properly to mitigate the risks of altitude sickness. A longer itinerary provides a better acclimatization opportunity to increase the chances of a successful summit.