In-ground hydraulic lifts fell out of favor some time ago. First, they were expensive to buy and install. Second, they were more or less permanent, so you couldn't move them if you wanted to rearrange your shop floor. Third, they required some maintenance, although really not that much. Finally, you needed a good shop compressor, but every shop had one, to run the pneumatic tools.
So, pretty much nobody installs new ones these days. They still have lots of things in their favor though, including the things I mentioned above. I like them. I've never owned one, though, but I did once dream of having one installed in my driveway, outdoors, for working on my own vehicles. Never did it, though, and I'm too damned old to consider it now.