I think everyone needs at least a P, J and MM in their collection, as an acknowledgement of the story of our instrument over time as well as for changing things up and keeping them fresh. I very much have a ‘go to’ but sometimes play one of the others for weeks on end before getting a craving for the other. Every time it feels like getting a new bass!
Of course if you don’t have the space or need to free up the cash that’s a different story and it’s kind of nice just having one bass, too.