Stock answer: It depends. It depends on numerous factors in this case.
1.) What type of bass is it? A single pickup bass used strictly for recording doesn't need any onboard controls whatsoever. The board does it all. Maybe a kill switch, but that's it.
2.) What model is it? A single pickup instrument only needs a volume and tone to supply a wide range of tones. A triple pickup model may need a whole row of knobs and switches.
3.) Is it more of a utilitarian instrument or a stage prop? (Only for show.) Basses used for certain stage numbers may fall into the first category, only the FOH replaces the board.
4.) Is it the stock configuration for the model? Heavily modded instruments may have a learning curve. In many cases this is not a good thing. If it's your design, it's okay then.
5.) Do the controls really accomplish anything? Bumping into fifteen toggles in the middle of a song stinks. Especially when flipping them has no perceptible tonal variation.
6.) Are the controls part of the aesthetics of the instrument? Even if you only use one setting, if the bass looks cool and inspires you to play it's worth having multiple controls.
7.) Do extra controls add to the weight? This topic has gotten so important lately it surely must rear its hideous head in this department, too. So, does a 500k pot weigh as much as the same amount of wood? Which species? Maple or basswood? Hmmm. Better break out the bathroom scale. This is a touchy subject best left to the experts.
Personal preferences are all that matter in this discussion. If you own several instruments of various types chances are you've managed to get comfortable with them. I never heard of anyone turning down a great instrument due to the number or configuration of the controls. If you really like a bass, you'll eventually get used to it. (Unless it's a 24 fret blue '92 Carvin LB70. That's another story entirely, but I digress...) Hope this didn't bore you. Happy Fourth Of July!!!