I think the difference between arbitrary code in buildfiles and an obscene zoo of plugins running arbitrary code is rather small in terms of actually understanding the build.
My takeaway from using both maven and gradle is that I would really love to have a build system with emphasis on allowing custom arbitrary code, but only within guiderails that force them into a shape that is easily factored into a plugin if you layer decide to do so. Maybe even with a defined reverse path for unboxing existing plugins back into their inline form (for when you absolutely need a fix/unexpected customization, but can't commit to fully maintaining the plugin)
> I think the difference between arbitrary code in buildfiles and an obscene zoo of plugins running arbitrary code is rather small in terms of actually understanding the build.
Completely disagree. Off-the-shelf plugins behave in defined and documented ways, and understanding a build that uses a particular plugin just means reading that plugin's documentation. When you allow arbitrary code in the build file, it means you have to puzzle out what the author was trying to do, for each and every case where you see unusual arbitrary code. You also get into situations where there's more than one way to accomplish many tasks, so you have to learn all of them instead of relying on a standard built-in method.
Sure, any random maven user in your organization can write a plugin to add undocumented behavior, but I rarely see that happen in practice. Even though writing a maven plugin actually is pretty easy, there's an implied barrier both in setting up a plugin project and writing it, as well as publishing it in a way that that a consuming build can use it. So you end up with it being rare to write a custom plugin. There are very few things you can't do with off-the-shelf maven plugins, and arguably I'd rather be restricted and be unable to do some things than have to deal with the mess that arbitrary code creates. I've seen it time and time again with people who try to introduce sbt into my org, and it makes me want to scream.
My takeaway from using both maven and gradle is that I would really love to have a build system with emphasis on allowing custom arbitrary code, but only within guiderails that force them into a shape that is easily factored into a plugin if you layer decide to do so. Maybe even with a defined reverse path for unboxing existing plugins back into their inline form (for when you absolutely need a fix/unexpected customization, but can't commit to fully maintaining the plugin)