"immediately lost control of it because all its components except the BIOS were COTS" is also a good description of the Apple II, but Apple was able to mostly keep clones at bay in their key markets. I believe IBM could have as well, but didn't initially care enough (the PC was a small part of its business, but micros were 100% of Apple).

Note that they took out 7 patents on the PC AT (286). When their attempt to take back control via the PS/2 in 1987 failed, they spent the 1990s getting chipset makers and clone makers to license their patents. Had they tried this in the 1980s the industry might have gone in a different direction.