No World Wars? Bloodier WW?
I know that's a popular talking point, but I’d think that the “war advances technology more than peacetime” narrative is compromised by the deaths of so many potential scientists, engineers, technicians, and other would-be innovators during wartime. A hell of a lot of money and economic productivity is also poured into waging wars rather than R&D ventures, not to mention how people’s priorities are elsewhere when they're managing refugee crises or rebuilding their rubble-ridden countries, rather than earning their PhDs or becoming the next Alexander Graham Bell, when so much of their infrastructure has been shelled or bombed into oblivion.
Besides, just because a technology was invented under a specific circumstance IOTL, doesn't mean it couldn't have been invented under a different one IATL. In fact, there may be cases where technologies that had roots in wartime applications are invented under more peaceful circumstances for civilian use, so I think it’s presumptuous to simply assume that radar or what have you couldn’t have arisen in a "No World Wars" world, for example (though it may go by a different name, despite essentially being the same thing).