I can't be the only person still using this stuff.
I'm still using it! I have downsized my X10 setup accordingly as I have downsized into a smaller, temporary dwelling after getting married. Once our new house is built, I plan to upscale the HA dramatically and shall still be using X10 in it (though not exclusively). I have a huge tote and a few other boxes of X10 gear that's currently not being used.
Or, is it all working so well that nobody is asking questions?
Yes! We're still using X10 PLC and RF here, Jeff Volp's incredible XTB-IIR repeater and XTB-232 "real time" CM11A replacement, and some custom scripts coupled with the ActiveHome Scripting "SDK". The latter are running on a Windows Server 2003 server, which is still running for various other reasons, but I also got the AHSDK working on Windows 11. All still working very reliably, and I just haven't had anything new to share nor ask.
I do still visit the forum every couple of weeks just to see what's new and have had the same sentiment as you.