Could the size (aspect ratio to be precise) of the visualizations in qlik sense be locked so as to display certain information at all times?
I don't think this is possible. I recommend finding an extension that satisfies your needs and altering the rendering functions.
The objects on the accesspoint cannot be resized by the user unless they duplicate the sheet. Based on the permissions the user can publish the modified visualizations.
I can understand that qlik sense was built to be "viewable" on multiple platforms depending on the available resolution and aspect ratio. But could extensions address this problem?
In order to do this you would be best placed to create your own mashup and not hard-set the dimensions of each object (meaning removing the responsiveness).
With Qlik Sense this is not difficult.
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