I am surprised to hear this as well. We had Jenkins in my previous gig. It worked, but I spend all my time keeping it humming and learnt nothing else. In my current gig, we were a Drone shop. We switched to Harness CI enterprise and it’s worked really well for us. Their hosted builds are pretty speedy!
We did evaluate Gitlab CI but went with Drone. Gitlab CI is not a top 5 CI vendor IMO.