It's design / architecture has the right concepts of a (generic) builder: Target, Dependencies, Nodes, Toolset, Builder, Scanner, Environments, Configure Checks.. and it does it as a Python module, the right language for the task. That means that any task that you will need to do building your project has already a good concept to represent it and most probably already an implementation of it that does it, and also that you don't need to know any new language/syntax, but just an API/Module of a well-known language that is cross-platform by nature.

scons can be customized using Python. So you get all the power of python with you while having scons

Scons is a build system written in Python, and build scripts are written in Python. This is a good thing as it gives you the debugging flexibility tou can’t find in other build systems. Anybody can use Python so anybody can maintain a Scons build system, in principle. Scons is amazingly powerful, but it allows you to diverge a lot from its intended use. If you don’t do things the Scons way, you will soon run into trouble. It is also good in maintaining a correct build, if you use it right. It is easy to create custom commands to automate common tasks. Again, Python is the real power here.