Firstly, the adoption of smartphones is ongoing there are still people with "feature" phones (for whatever reason). As technologists/early-adopters we have an observation bias that everyone adopted them overnight, it's simply not the case. Secondly, the adoption of tech in entrenched industries is much slower because the decision makers are older and more risk-averse. Next is the cost-benefit of the adoption. If it costs 5-10x to adopt a "driverless" truck that still requires a skilled driver for 2% of cases there is still very much a driver on-board, only now they have to be retrained in the new skill.