I disagree with this. I have a bubinga neck with wenge fretboard on my avatar bass (I love that tonewood combination, btw), and one of the great features of it is it requires virtually no maintenance at all. Nothing more than the wipedown you would give any other wood on any other bass.
If you checkout some of Michael Tobias (a renown Luthier builder) Utube videos on bass set-ups, you'll hear some recommendations: Depending on the wood species of course and environment conditions; Oiling the fret board with every string change (ever hear of fret sprout?) Wenge is a wood that should be monitored due to its open grain, if not sealed in some way.
Hand rubbed, oil finishes have a tendency to literally gouge and chip away from aggressive slap/pop techniques and stain/darken where thumb and fingers rest from perspiration/oil exposure. Theses issues are greatly accelerated if the finish is not properly cared for and protected.
Warwick kits come with wax and recommendations for example.
Like I said "exotic woods and certain finishes require routine maintenance..."
Poly/Ureth and Nitro (special conditions apply to Nitro) finishes can be simply wiped down and scuffing, minor scratches buffed out.
I enjoy the time caring for and personally setting-up my instruments, some are more low maintenance than others. But IMO, there are definitely different proper maintenance requirements for different wood species and finishes.