If you look at IBM's history you can see how reliability and the ability to manufacture components in quantity played a huge role in the adaptation of both. Bell Lab's early point contact ones weren't manufacturable. IBM didn't move to proper ICs until 1970 with the System/370 because anything they made including the low end would be sold in quantities too high for ICs before then (System/360 Models 85 and 195 preceded the 370s by 1-2 years, but they only sold 60 total units).