I like to see (and feel) the grain and I think it's in line with an overall design tendency in the last 20 years or so not to hide the natural surface structure of something anymore. It's strictly cosmetic too, doesn't make the bass sound any better (some would say worse!
) or more durable. A bass is essentially a piece of wood (or several), I don't mind that you can still feel and see that (I know: "Buy a Wishbass then instead!"
) as long as I don't draw a splinter from it.
The mind (my mind at least) is a funny thing. When I held my first Gibson TBird in hand in 1998, I was horrified at the wavy kitchen brush paint job with dents in the wood and all. These days I like that and rate high gloss ultra-even finishes as cheap along the lines of "what are they hiding underneath it?".
But then what do I know? I also like the carved look of my LP BFG which, interestingly, always attracts attention from non-guitar- and non-bass-players alike who marvel at the rugged surface ("Is that crocodile?").