BENGALURU :Tata Consultancy Services, India's top software-services exporter, missed quarterly revenue estimates on Thursday as its clients stayed cautious about non-essential spending amid tariff-related uncertainty. The revenue shortfall at TCS, the first Indian tech major to report results, raised concerns about future demand for the country's $283 billion IT sector and dragged down U.S. listed shares of rivals Infosys and Wipro. "The trend of delays in decision-making and project starts