Having an emotional breakdown is normal if you've been repressing and become overwhelmed. It can be re-traumatizing if it happens in an unfavorable time/place,

Having an emotional breakdown is normal if you've been repressing and become overwhelmed. It can be re-traumatizing if it happens in an unfavorable time/place, and I'm not saying it's even necessary for healing. But, it's not a "side-effect" of meditation, and it suggests that meditation does exactly what it says on the tin. It's confronting thoughts and feelings that you find dangerous enough to suppress. These are the things causing neuroses and unhealthy behavior patterns in your daily life. Dealing with them isn't always going to be enjoyable or even safe. So, similarly to taking psychedelics: manage your dosage, and if you want to go deep make sure you're somewhere that you feel safe and supported.