It does not only installs the msys + git environment but also launches the msys shell.

I assume that 90% of the time this script will be used for launching the msys environment... but the initial description and the file name does not give any clue about this.

Also, from my point of view the main goal of this script is to launch the msys shell... and installing it is just a side effect caused by missing files.

Maybe the filename and initial description should be updated to better describe the purpose of this script.

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It installs pre-requisites needed to  build the sources... but this is a very narrow description.
This is one reason why we need it... but if fact the script just install an usable git + wget.