If the author goes "I couldn't find enough high quality studies on the topic I'm discussing", then the conclusion should be that we need more studies, not to come to unwarranted conclusions in the absence of actual data.

> Well some people are spending money and time investing in blue light filtering glasses and other solutions.

Ironically, we actually do have a number of good studies on the effects of blue light filtering glasses (easily findable with a Google search) and they do demonstrably reduce onset of sleep time. Where more research is needed is on software-only filters for screens.