Even the promised Linux compiler will be a by-side product of the Android one - Delphi doesn't generate Android "Java" code. It will be another LLVM based product, and not fully compatible with Windows code, because of ARC vs. manual memory management. They plan to add ARC to the Windows compiler too, but it will require a lot of code changed, and ARC IMHO is no good in highly scalable and concurrent applications - mostly good for "client" stuff with a few threads only - exactly the client of applications you're not going to develop on Linux.
The IDE is historically a Windows one, and when they also injected a lot of .NET code that made porting even more difficult (and even .NET Core may not be enough).
But looking at the still dreadful state of Linux GUI widgets, maybe it is not that bad...
Now they have FireMonkey widgets as a portable GUI, but being fully "owner drawn" like Java Swing, I believe a full IDE written that way would be actually very slow on every platform. Oh well, people use that lethargy simulator called Eclipse...
Biting the hand that feeds IT
