The article you linked not only says it is a net positive but provides a link to a meta analysis to prove it. The counterpoint being that (particularly unguide

The article you linked not only says it is a net positive but provides a link to a meta analysis to prove it. The counterpoint being that (particularly unguided) meditation may have adverse affects depending on the person, mood, and environment. But the number of people reporting this was a significant minority (10-25%). The studies showing these negative affects are also reports of specific events, not chronic behaviors or association with the inability of meditation to achieve it's goal. That is, they asked if any people meditating over two months had experienced feelings of dread during or after meditation at any point. This was not compared to any indicators of mental health, so no relationship of the link of adverse affects to those struggling. Another example: the study showing low quality sleep in those who meditate often paradoxically shows higher levels of arousal and a statistically significant benefit toward those with depression. It also counteracted their own prior research that showed only slightly less meditation increased sleep quality in adolescent substance abusers. They then talk about needing further study to find the nature of the conflict because they have a small sample size and use self-reported data. The overall conclusion and general scientific consensus I've personally seen (though I am NOT a researcher or authority on this) is that meditation can be quite helpful for those suffering. But that without help it's possible for it to be an opportunity to ruminate on the source of anxiety or get frustrated/aware with any lack of progress. Mind you, this coming from someone who has personally experienced "sat down to meditate but had to stop when my thoughts focused on huge TODO lists and got anxious".