This statement is highly questionable in light of modern technology and signalling equipment available that is capable of placing rakes just short of the next station's platform even. Having said that, increasing stops definitely slows down the train's overall travel time due to deceleration, stoppage time, potential signal clearance wait time, and then acceleration back to MPS. In addition, increasing stops impacts the time taken to reach destination for end to end passengers making the journey unviable for them in some cases. So the sentiment is laudable, but the reason given is not appropriate.