> Because the 8086 had no facility for emulating an FPU (unlike the 80286 and later processors), the emulation mechanism was somewhat complex and required tight cooperation of assemblers/compilers, linkers, and run-time libraries.

The article goes into some detail on the extra effort required to implement FPU hardware emulation on a platform that did not especially support it.

Modern implementation of FPU emulation might be more straightforward.

I haven't worked with FPU emulation on microcontrollers, which is probably the most common use case these days.