craigb
What's wrong with a natural neck and Tung oil? 
I hate those poly necks where it feels like your hand doesn't want to move...
Sorry Craig. Not sure who you're asking nor why you have that question.
Would you quote where somebody said there was something wrong with a natural neck with oil finish?
Or are just asking...if so;
Natural with oil finish is my preference. What's different about it, not wrong, is that with an oil finish on a guitar-neck or body- in time it will probably need attention. One may need to apply more oil and it's easy to get bad results. It also takes time.
If it's just the back of the neck not so bad but if it's the whole guitar then it's best to disassemble the guitar.
There are conditions so time the guitar is out of service is hard to say.
I'm trying to answer you because that little guy seems to be looking up at my last post.