I really don't know. You don't get Testing at the cost of "a little" instability. You get it at the cost of things eventually breaking in an update, and you having to sort it out on your own. It's a failure mode quite unique to it, and nobody mentioned anything about this. So yeah, I don't get any reason to believe either way. (Also, Unstable isn't supposed to have this one failure mode, but it's supposed to have partial failures way more often. That fits the mental model of "instability" for most people much better than Testing.)
But then, the alternative people are talking about is Ubuntu. Ubuntu breaks much more often than Debian Testing... Up to the point where people don't upgrade it carelessly, so they experience a more stable system. So again, I don't know. IMO, it was worth at least putting a warning there.
I really don't know. You don't get Testing at the cost of "a little" instability. You get it at the cost of things eventually breaking in an update, and you having to sort it out on your own. It's a failure mode quite unique to it, and nobody mentioned anything about this. So yeah, I don't get any reason to believe either way. (Also, Unstable isn't supposed to have this one failure mode, but it's supposed to have partial failures way more often. That fits the mental model of "instability" for most people much better than Testing.)
But then, the alternative people are talking about is Ubuntu. Ubuntu breaks much more often than Debian Testing... Up to the point where people don't upgrade it carelessly, so they experience a more stable system. So again, I don't know. IMO, it was worth at least putting a warning there.