One of the disadvantages of the Lemosho Route is that it is not so much off-the-beaten-track as sometimes perceived. Due to it’s increasing popularity and because it merges with the Machame route halfway to the summit, you will have to share your climb with many others.
Furthermore, the hike ascends slowly which causes you to cover long distances on a daily basis. You need to be in a physical condition where you can confidently walk almost an entire day without wearing yourself out.