Discreet components are ones that won't tell your wife that you're having an affair with the babysitter. Discrete means "in separate parts," such as transistors and resistors, as opposed to circuits that are integrated onto a chip, which have gone so far as to adopt the name ICs.

It's not quite as simple as discrete components guaranteeing no problems. Trash can still be made with discrete components, and the quality of available output ICs has been quite high for forty years.

Other than that, yeah, if it's okay with a four ohm load, it should be okay, period. If the system is okay with a four ohm load, the only thing less than ideal is that it will bother our purist sensitivities and, in the sound environment, one channel will be louder than the other.