I guess I follow the trend here as well. In my youth I was a tinkerer, and whether it be a lawnmower, alarm clock, or electric bass, I had to take it apart to see how it worked. This insatiable desire to see how things ticked allowed me to learn a lot about various instruments, and modding my basses was just a logical approach for me to get what I liked set up in a bass.
My main touring Precision suffered the most abuse (or mods, if you will) all which I wish I wouldn't have done, but they work and is all good. In the 80's I sanded the back of the neck to remove the gloss, because the guitarists Charvel was set up that way and was cool. I rubbed boiled linseed oil into it sealing it, but it took a long time not to be tacky. A hipshot went on after I met Billy Sheehan and how that handy little device opened a lot of doors for a four string, and I also routed out the 70's position for a jazz pickup, then added a schaller bridge because I loved how I could set the string spacing. It's a great player, but I wish I would have left it alone. She does have charactor though. She is a 1985 MIJ P bass, and built as good as any American bass from any era.
My 2011 American standard jazz fiver I have left bone stock, because it played and sounds amazing. There isn't anything I'd want to or could do to make it sound or play better.
The Mim's usually get some sort of fret job, fret end detailing work, and electronics or hardware based on how they feel and play. I like the feel and spacing of the Gotoh 201b for my four string basses, so I'll usually put one on a player I'm gigging a lot with. I will replace the tuners based on how they feel, not due to weight. Same with a nut. If it's cut good from the factory I leave it alone.
So in a nutshell, I have a certain feel and sound I like out of my basses, and those that I play a lot generally get mods to get them into those specs. this goes for all my basses, Fender or non Fender.
The newer basses are simply amazing cost v quality, due to low overseas assembly and cnc machines getting things right. Older fenders were all over the map in quality, and hence made a good argument to mod to get them in the sweet spot, or outfitted with items the factor wouldn't provide. These were usually fashionable time sensitive mods, but they do reflect certain times and eras in music.