I think it's fair. Unix has a lot of legacy baggage. It's largely terminal-based with three character folder names and two character commands, a monolithic kern

I think it's fair. Unix has a lot of legacy baggage. It's largely terminal-based with three character folder names and two character commands, a monolithic kernel, the C programming language. In contrast, Acorn's ARX was fully graphical, used a microkernel and was written in Modula 2+/3. It sounds like the hardware wasn't quite ready for it though.