Only "experimental" status on Windows is definitely unfortunate for Windows SBCL users.
However, today in 2022, the server world has been eaten up by Linux. Few if any production server deployments would run on Windows -- there definitely might be some major ones but an overwhelming number would deploy to Linux. Then there would be a lot of developers that run Linux in a Virtual Machine, dual boot, use WSL/WSL2 or have a dedicated Linux machine.
There is also a influential but niche developer crowd that runs MacOS.
What I'm trying to say is that not having full support for Windows hardly implies "[SBCL] doesn't want to be a serious language, but rather a toy for academic types."
A statement like this may have been true in 2000. Not in 2022.
Windows is no longer the most important platform for people who either develop software or deploy software to servers.
I am not trying to criticize Windows in any way. It's just the reality that a big chunk of development action is taking place on Linux (and in a niche way on MacOS) today.
My objection was to the statement that "[SBCL] doesn't want to be a serious language, but rather a toy for academic types". And to that I implied that Windows is no longer as dominant in 2022 as it may have been, say, in 2000.
If you do want Windows support for Common Lisp, happily it exists! But primarily from the commercial CL versions, LispWorks and Allegro CL.
FWIW, I've used SBCL on Windows, and never had any problems. I wasn't using CFFI, POSIX, threads, or things like that, so that probably helped.
I find each platforms native toolchain good in their own way. Each has it's particular quirks. The thing is that when you learn the quirks on one platform, the other platform has other quirks - hence it likely feels "worse" for a while, when in fact, it's just "different".
I'm using Visual Studio 2019 and ReSharper at work right now, and it's a slow, bloated mess compared to dev environments I've used on Linux and OSX.
Sorry to rant, but I recently started a new job using Windows for the first time in about 10 years, and the slow dev environment is my only pet peeve.
If you office policy allows, try disengaging it. A few versions ago Visual Studio had lots of missing features that ReSharper provided instead, but in 2019 and 2022 the gap is considerably smaller.
I am using visual studio daily and 2022 is particularly snappy.
Also - In work setting some end point policies enforce anti-virus software that converts the system to an unbearably slow state.
If you prefer posix tools for command line use (IMO they are much more ergonomic than powershell) wsl2 works pretty well for grepping and such.
Even though I use windows as my OS, I do most of my coding in WSL, so I still don't need a true windows version of things I work on.
True windows support in my experience usually requires paying someone (unless you are doing something graphical, where Windows often is the best choice).
Node.js used to have patchy support for Windows. It took time and investment from Microsoft themselves to fix that.