[Q] New executable for single player mods, why?

So looking at the best DeusEx mods released so far, why those usually have a different executable than DeusEx.exe? I mean, why not simple change the ini files throw command lines (2027,TNM stills do that, but also with a different .exe). I don't underspend why, for Deranged there is an launcher that calls DeusEx.exe with arguments for the custom ini files, that configures the game to run the proper player class and game class used in Deranged.
Project 2027 command line for 2027.exe :
Deranged command line for default DeusEx.exe:
Are there benefits?
Project 2027 command line for 2027.exe :
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Init: Command line: ini="..\2027\System\2027.ini" userini="..\2027\System\2027User.ini" log="..\2027\System\2027.log"
Deranged command line for default DeusEx.exe:
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Init: Command line: ini=Deranged.ini userini=DRuser.ini log=Deranged.log
Are there benefits?