Средства и методы разработки

Они "просрали будущее ARM'у" именно по причине существования самого ARM'а. Есть одна хорошая историческая книга (по ARM). Цитаты: 

..."In October of 1997, at the same Microprocessor Forum event where

ARM9TDMI took the stage, Motorola disclosed their self-proclaimed

“ARM killer”. The M-Core microRISC engine borrowed heavily from

ideas in ARM, SuperH, and the just-introduced MIPS16 architecture; a

32-bit core with a 16-bit instruction set, a four-stage pipeline, and 16-

entry register file. This gave it similar code density advantages.

M200 family was fabbed on 0.36 micron, initially clocked at 50 MHz. It

achieved 0.41 mW per MHz at 1.8V."...

другая цитата:

..."

During and shortly after his tenure, things hadn’t gone so well for

Motorola. In response to overcapacity concerns Ruiz started the “asset

light” initiative, consolidating fabs and sending about half of chip

production to foundries. Multiple reorganizations created an exodus of

talent. Missed commitments at the mid-range and high-end of the

PowerPC roadmap left Steve Jobs and other customers fuming.

M-Core did not go as planned, either. It certainly hadn’t killed ARM, or

even slightly flesh wounded them. In fact, it did not get far beyond

Motorola internal use. Staffers, including design center leader Jim

Thomas, were fleeing to work elsewhere – many heading to Intel to

work on their next ARM project.

"...

в 2000х Motorola приобретет архитектурную (высшую) лицензию ARM:

https://www.eetimes.com/arm-license-for-motorola-hints-at-lost-faith-in-mcore/