What do you mean they struggle to hold conversations? I was an awkward kid and you could say I struggled to hold conversations but it wasn't due to an addiction to tech. I'm also socially well adjusted now, as an adult.
There can be multiple reasons for the same outcome in a complex system. Prevalence of social awkwardness at certain developmental stages due to variances in individual immutable developmental schedules should remain stable over short time frames. Unless you think the researchers/teachers are incompetent enough to have not accounted for the baseline levels of social awkwardness, then the fact that some people are awkward because genetics or whatever is an irrelevant point to make.
