I like it a lot, but the project appears to be mostly unmaintained since mid-2021, when the creator left it to work on a lispy CI/CD tool [0] that feels very complicated... not sure what's going on there.
I use it at work but it was already running when I got there. I also really like it but I'd be reluctant to stand it up somewhere new unless I was using it to run a Cloud Foundry. It has some operational issues and it is actually impossible to get an SLA if you're not also a VMware Cloud Foundry customer, and that costs a minimum of $50k per year.
I don't doubt that VMware failed to nurture Concourse's maintenance post-acquisition. I hesitate to make sweeping statements about the legendary virtualization behemoth, but I personally doubt their commitment XP dev/ops culture.
Edit: don't take my word for it, read someone more closely involved to this day, Nat Bennett https://www.simplermachines.com/some-facts-about-concourse/