While my studio is digital in a recording/mixing sense, I have vast analog wiring between that stuff and my collection of synths, drum machines, modules and outboards.
My initial reason for this was due to at the time I made these purchases, that windows and windows software was mediocre at best for audio. Midi? Yes. I've been using cakewalk (and now sonar) since version 2.0. But in those days PC audio was pathetic and recording multiple tracks simultaniously was nearly impossible.
Things have come a long way of course with all the multi-processor computers and vast amounts of memory, and certainly the in-PC mixing software with all the synth, drummachine and outboard "plug ins".
But I have to admit, I am an avid knob twiddler. I do not find the mouse (or trackball in my case) intuitive. I learned to record and mix on fully analog equipment comprised of a vast plethora of vacuum tubes. My first venture into the pro-studio marketplace was with an old, big neve from the 70s, which was transistor based for the most part. That and a pair of 24-track Otaris. Knobs and switches for everthing, and what you couldn't do with a knob or switch you could do with a patch cord - sometimes weird homemade ones.
I realize and accept that you young folks like your computers and find them more intuitive than I do... and you'll have to pry my knobs from my cold dead hands

And that's okay, it's preference thing, it's a "use what you know" thing, etc.
My reasons for going digital in the first place was not the sound quality - but rather 2" tape is expensive, getting difficult to find, effected by weather, humidity, and re-use. It also takes up lots of space and a real pain in the ass to splice. *I* had gotten so good at splicing that I could cut out a track off one tape (lengthwise), and glue it onto another tape to combine stuff.
Digital allows you to record again and aain without loss of quality, and replace current takes with old takes. Bounce and merge tracks without loss. And so on. There's a huge convienence factor there which speeds up productivity which of course reduces the studio's impact to customer creativity.