It's possible to implement high-level abstraction in machine code, or compile a high-level language into low level machine code, however it's not possible to hide low-level, machine dependent details in a low level language. It's not possible to hide machine opcodes in machine code, or CPU registers in assembler, or stack in Forth, so a developer must learn these things and deal with them, which makes the development process slower.

So, it's expected to see an order of magnitude improvement in development speed, on average, when jumping from machine code to asm, or from asm to a 3rd level language. Forth doesn't improve speed of development by an order of magnitude comparing to asm, because of the steep learning curve and low level stack management. I tried to learn Forth multiple times, but still cannot program in Forth freely, which makes it unique among 20+ other programming languages I know.