Weird... I carry a few folders that some consider overbuilt, yet they suit my purpose just fine. There is always an undercurrent of disdain for heavily built folders, and I can only guess it is by those that only need a certain type of cutlery. Their needs are probably satisfied with small knife. And since they have identified their own personal baseline, they cannot comprehend those of others.
Except as personal preference, I can't really see a set of rules for what is "overbuilt", what is "perfectly suited", what is "too lightweight", etc. I like my heavy duty knives for job site use. I like their larger size for better grip, thicker blades that are suited for all manner of use, and appreciate the fact that the blades don't flex, the locks don't wear out, the blade edges are cut a bit more obtuse than a slicer, and they feel like a sturdy tool in hand when working. So are they overbuilt? Not for me.
If I carry one of them on the weekend, it is probably out of habit or I am going hunting or hiking. For cutting just about everything else, my small traditional stockman will open mail, cut up fruit, half a sandwich, sharpen my carpentry pencils, open an Amazon package, etc. I carry that knife or something of similar size regardless of the work knife I have, so likely I have two knives I carry. Since I carry two knives... maybe I am doing an overkill on the knife carry? Can't easily trim a shingle with my small stockman, and can't easily pluck out a splinter or open an plain envelope with my ZT 0909.
This thread kind of reminds me of when I started in the trades and had a Buck 110. The old hands on the job gladly pulled out small trappers, small stockman, and sneered loudly at my Buck. I heard comments that ranged from "why don't you just carry a hatchet or machete" to "if I need a boat anchor, I'll be sure to call you". Later, that knife became a job site staple of it ability to last under tough conditions and overall reliability. Same thing, though. Waaaayyyy overbuilt to the eyes of some.
Seems to me there is a place for just about all knives when matched up to the job correctly. Then of course, there are those of us that just carry the knives we want when we want.
Robert