FIA president Jean Todt believes too much money is being spent by the top teams to make their cars last for the vast majority of the season.
Lewis Hamilton became only the third driver in Formula 1 history after Juan Manuel Fangio and Michael Schumacher to win a World Championship and complete every single lap of the season in the process.
While Todt acknowledges Hamilton did not make any mistakes, he thinks he had too much of a powerful car at his disposal.
"Hamilton did not make any mistakes, but he also had an incredibly strong car, strong in terms of performance and reliability," Todt told Auto Bild.
"Even if the Mercedes was not always the fastest, Lewis scored points in 20 of the 20 grands prix. The cars are too reliable."
"Ferrari impressed me as well but I stay with what I said: Ferrari and Mercedes were too reliable.
"That costs money. Tests, simulators, it's all too much. We don't need all of that for a good sport. Actually, the contrary."