However, the case of meditation/mindfulness shows that it can take a very long time between a treatment being invented and it being proven to work. It was called pseudoscience until it was statistically proven to work. Unproven is not disproven.
But it takes discernment to know which unproven thing might work and won't hurt though. TCM sounds more dangerous than not because the herbs you can get will be unregulated and possibly contaminated.
Something can simultaneously be a pseudo-science and still work. Do some aspects of TCM have benefits? Sure, probably – it's a huge field. But that's more coincidental than anything else, and their mechanisms of action are unrelated to TCM's pseudo-scientific theories. If you go to a forest and start eating random stuff then some will also have some benefit.
I'm not familiar with the history of meditation or mindfulness, but I've seen people claim some pretty ridiculous things about yoga, perhaps the most ludicrous was someone claiming that some positions will prevent certain cancers due to "massaging your organs". Yoga absolutely has benefits but that's just nonsense.
But it takes discernment to know which unproven thing might work and won't hurt though. TCM sounds more dangerous than not because the herbs you can get will be unregulated and possibly contaminated.