Mayhap. But log obsession? No. I think they just thought to stick with the logs because, well....Zelda games seem to be set around a sort of medieval time. So, Back then, there were settlements and towns, but not so many, There were more trees back then. So maybe Nintendo thought to highlight that?
I don't think so... the only really plausible reason I see, as I stated earlier is that it is for gameplay design... A log would fit almost anywhere in the overworld, am I wrong?
So they made it a log to not seem out of contest...