I like plain beech too.

But if you do go ahead and oil au naturel, then it will be very hard to stain later.

The big advantage of not staining is the fact that you can do simple repairs to minor damage without having to re-do the whole stock.

How rubbish would it be to steam, sand and re-oil a tiny 1cm ding in a red-brown stained stock?

It would stand out like a big sticky-out standing thing.