Yes, I totally agree with you.
Post World War Japan started with just electronics and automobiles. The inflow that happened was more or less completely used in developing other sectors like healthcare, robotics, railways. UAE, like all Middle Eastern countries started with just oil but almost instantly realised that reserves would dry up one day and the result is what we see today; aviation, real estate, tourism, finance. India started its journey with using its IT talent to attract MNC and foreign investment. But as we know, Indian people are always striving to become the global pioneers and soon all the revenues were used to prop up other sectors like electronics, semiconductors, automobile, pharmaceuticals, aerospace. South Korea too was known just for its shipbuilding. But now they've successfully used that inflow to become leaders in electronics, steel, automobile, IT.
Now let's come to reality
Three of the aforementioned cases are what has happened and one is what could have happened. And I'm damn sure I don't need to tell you which one.
Let's leave all the different sectors that could have been developed using the money from IT exports and just talk about these IT firms. Out of the infamous WITCH, how many do you think truly diversified with the revenue instead of just keep doing what they were doing decades ago?