The best data illustrating the point are for home internet access on educational outcomes.
In early development, we see a negative effect [1]. Young kids with more home internet do worse than those with less of it. In middle and high school, that effect reverses [2]. (There are better studies on this in the EU.)
Bill Gates absolutely benefited from having a terminal at his high school when others didn’t. There are lots of similar examples across America and history. I know of no similar anecdotes for any technology when it comes to young kids since we banned child labor. (If you start laboring at 8, yes, getting familiar with and locked into the tools of your trade at 5 will advantage you.)
The burden of proof in early education should not be on parents and policymakers to prove harm. It should be on proponents of novel tools and methods to prove benefits.
[1] https://www.sciencedirect.com/science/article/abs/pii/S03043...
[2] https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3614074