Yes, the Altitude32 is clearly more expensive. I am also not sure, whether this will be a good investment or not. Currently I am far away from buying. First, I want to hear this unit and it is not easy to find and there are many open questions for me.
Can you replace/upgrade specific hardware e.g. HDMI boards? What are the limits of the software upgrades? etc.
If I would buy such a unit for a lot of money, it has to last at least some years. Or I go the 'hire and fire' way with much lower priced pre/pros. I will wait and watch how things will develop. Also, I need to listen to atmos, dts:x and auro 3D, if this is worth the upgrade. There are so many open issues and questions - as you already wrote.