Speaking only for myself, if I bought a new/used firearm with or without this kind of safety, and IF it functioned correctly in that state, I would leave it as is for a while. I would want to get comfortable using it, cleaning it, trying to get accurate with it, etc.
If in good working condition, I would not try to modify something new to me right away, because I would feel I was missing an opportunity to learn something about how it works the way I got it.
As far as safety in general goes, the most important "safety" is the operator, whether the equipment is a firearm, car, hand tool, machine tool etc (well, at least unless you like driver-less vehicles, lol)