Hey, take that back! 68k/ColdFire ISA is actually pretty well supported these days by compilers. Better than it was a few years ago. There are 68k backends for both GCC (again) and LLVM (maybe not as active).
It's probably the best supported "retro" architecture at this point.
The LLVM code is fairly active for a retro arch. It just got accepted into mainline less than a couple years ago. I remember it because the m68k folk are pretty active about maintaining support for their arch in the Linux kernel, and for a while the lack of m68k support in LLVM (and therefore the lack of m68k support in Rust) was seen as a potential blocker for mainline Rust support in the kernel.
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Hey, take that back! 68k/ColdFire ISA is actually pretty well supported these days by compilers. Better than it was a few years ago. There are 68k backends for both GCC (again) and LLVM (maybe not as active).
It's probably the best supported "retro" architecture at this point.
Rest of your points are valid though ;-)
The LLVM code is fairly active for a retro arch. It just got accepted into mainline less than a couple years ago. I remember it because the m68k folk are pretty active about maintaining support for their arch in the Linux kernel, and for a while the lack of m68k support in LLVM (and therefore the lack of m68k support in Rust) was seen as a potential blocker for mainline Rust support in the kernel.