Now you are making things up and clearly do not understand what architecture software is and what is required for Architects to use. AutoCAD; ArchiCAD, and others like it are only available on Mac and PC, not the iPad. That is a fact. This kind of CAD software only runs on Mac and PC and is very resource intensive. The features in these applications are required for the work of a professional Architect and are mostly unavailable in shell based applications on the iPad. For instance, AutoCAD has a 360 mobile app but lacks many of the features needed by Architects.
Things like Autodesk fusion run on machines less capable than my 2013 Mac Pro and the current iPad pros outperform that significantly.
There is nothing to stop an application making use of mouse and keyboard support for precise input, I've been doing that using various Remote Desktop applications on the iPad since 2012.
As above, performance is fine.
Thermal constraints are fine.
Hardware moved on from 15-20 years ago or whenever you did your architecture work. Yes, PC is the dominant platform there but that is simply NOT due to the limitations of handheld devices in 2024. It's market inertia, nothing more.
In the future, being able to modify a design on a tablet in the field and then use AR to place it in the real world though the display to see how it fits, etc. is something that no desk bound PC will be able to compete with.
No, PCs won't go away, but claiming that mobile devices will never be able to do this is just pure ignorance of technological progress.
The first version of AutoCad I used ran on an 8086 machine in CGA monochrome.
We've come a long way from that.