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.
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.