I like to think of this "good enough" thing by calling everything beyond "good enough" as irresponsible, and actually sabotaging those very same kids' future needs by squandering your (their) resources today on things which can not actually be justified.

That way, even if you were subject to feeling guilt over not providing the very best of everything, you can satisfy it this way.

"good enough" and "justified" must consciously and explicitly include some pie slice for "non-essentials" though. Some amount of "non-essentials" are in fact essential. Anything else is simply not living. So, once in a while, you do splurge on the expensive weekend.