I came here to say exactly this.

If developers are frustrated by compilation times on last-generation hardware, maybe take a critical look at the code and libraries you're compiling.

And as a siblimg comment notes, absolutely all testing should be on older hardware, without question, and I'd add with deliberately lower-quality and -speed data connections, too.

This is one of the things which cheeses me the most about LLVM. I can't build LLVM on less than 16GB of RAM without it swapping to high heaven (and often it just gets OOM killed anyways). You'd think that LLVM needing >16GB to compile itself would be a signal to take a look at the memory usage of LLVM but, alas :)