Yeah, I think the first factor is probably the biggest one here. Devs tend not to rebuild existing sites on a whim, especially not to integrate new technology f

Yeah, I think the first factor is probably the biggest one here. Devs tend not to rebuild existing sites on a whim, especially not to integrate new technology for the hell of it. We'll almost certainly see more container queries used on new website/app development projects going forward, but any that started prior to their integration into most browsers are likely going to remain using the old design philosophy with media queries instead.