They could, but there's no need to make the MSIs directly accessible to them. 
Most people look for the most friction-less means of getting their deployment 
done, they don't generally go out of their way to track down the components of 
the installation and invoke them directly.
You could always pass a property to each MSI and have a condition inside each 
MSI to ensure that the property was passed if the MSI wasn't already installed. 
That should reduce inadvertent direct launches of the MSIs.

> Date: Fri, 13 Sep 2013 16:33:46 +0200
> From: tobias.s1...@gmail.com
> To: wix-users@lists.sourceforge.net
> Subject: [WiX-users] "UI less" MSIs using just WixUI_Common or even 
> without<UI> element for Bundle Usage
> 
> Hi,
> 
> Following situation. Previously we used within our company a modified
> (derived) version of <UIRef Id="WixUI_InstallDir"/>. Now as we use a custom
> BAL together with the BURN Engine we can eliminate the UI dialogs in the
> MSIs. So in my understanding we head directly to a Setup layout as e.g.
> Microsoft does for Visual Studio 2012: Burn for installing almost UI less
> MSIs.
> 
> 
> What's the best way for modelling such "UI less" MSIs? At first I did
> following <UIRef Id="WixUI_Common"/>. Then even removed the <UI> element
> completely. The InstallDir is then passed by a property to the MSIs. These
> MSIs then are copied to some subdir of the Installation media.
> 
> Are there any pitfalls when using that approach? Customers then can
> directly start the MSIs?
> 
> Any feedback or experiences on that topic highly appreciated!
> 
> Best regards,
> Tobias
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2. Standardize and globalize service processes across IT
3. Implement zero-touch automation to replace manual, redundant tasks
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