I personally DON'T believe it's dangerous.
Maybe it's just my own personal anecdote, but I frequently take 1.5mgs of Klonopin (yes it is a LOW dose) with HEROIC doses of Kratom.
We are talking mixing 1.5mgs of Klonopin with single doses of Kratom as high as 16 grams and as much as 50 grams in a single day while on 1.5mgs of Klonopin with ZERO problems.
I just personally don't believe that PLAIN LEAF Kratom produces respiratory depression.
I know people will say that it's an opioid so it MUST but it is also a stimulant and their are dozens of alkaloids in the plant that have different effects that may counteract eachtother.
Hell, I've even gotten drunk on the combo of 14 grams of Kratom and 1.5mgs of Klonopin without issues but that doesn't mean that DRINKING on Klonopin is not an issue, that CERTAINLY is...but I don't personally believe mixing PLAIN LEAF Kratom (Extracts may be a different story) with CNS depressants like Benzos or alcohol poses significant risk.
Others may go crazy at that statement, but I stand by it.
We haven't seen a string of deaths from Kratom and so many people use benzos, booze or other CNS depressants that I think if the combo was as dangerous as mixing a classic opiate like Oxycodone with benzos we'd already have seen Kratom banned due to the number of deaths.
Also, nodding out from Kratom and/or feeling like your breathing is slow isn't necessarily TRUE respiratory depression.