Jenkins was a bad idea from the beginning
Especially because the only way to extend if was through plug-ins. Not surprisingly, later he modified the paradigm to become less "point-and-click" and more "programmable".
We were a few years ago in a strange situation where Windows developers were using CruiseControl.NET and were editing XML files in a text editor (and with some effort it was possible to write a lot of reusable pieces), while Linux developers were using Hudson (later renamed Jenkins...) and doing everything in a GUI with a mouse. with very little freedom.
From reasons I cannot fully understand, Jenkins became fashionable and now you have to use it...