Following asking for options around this in a 'Talk to experts' forum (thanks again for running these @Jamie_Gregory), I am ideating here for posterity:
Are there any ways or future plans to use a virtualised instance of the Mobile app (i.e. on a Windows client) to simulate how a Qlik Sense app will appear without using an IOS/Android device?
The premise of this is to allow a developer to gain confidence in simulated, isolated testing of how the Qlik Sense app can be expected to render before end user testing via the target devices themselves. Having this within the product capability itself, to render against a simulated expected screen size, would bring opportunities to address any key layout design flaws earlier in the context of Mobile app consumption.