Why silicon is preferred over germanium in manufacturing transistors?

For manufacturing the transistors we have majorly two semiconductor materials.They are silicon and germanium.But silicon is mostly preffered over germanium.

              The first transistor was made up of germanium only.since germanium has lower barrier poterntial when compared to that of silicon.The barrier potential of silicon is 0.7Vwhile germanium has 0,3V.
But we use silicon for manufacturing BJTs because,
1)silicon is thermally stable even at high temperatures while the germanium is not that much stable.
2)germannium has more leakage current
3)silicon is the most abundant element in the world.Thats why it is very cheap to manufacture.