This is basically the same thing as a charge-only BMS, except without the safety features that would cut off charging.
So if your charger messed up and went too high, this would not stop it from lighting the battery on fire.
I’ve also eyeballed these and thought about it, but never used them. I think a small charge-only BMS is much better as it gives you redundant safety features (in the charger and in the battery). That way if your charger failed [in a certain way] it wouldn’t be an automatic fire.
And if you wire your ESC around the BMS straight to the battery in a standard esk8 “bypassed” configuration, your ESC could still overcharge (like on a long hill braking on full charge) without cutting off brakes, but the charge port can’t overcharge.