Ultimately they had to if they wanted BIOS to be able to boot CD-ROMs. The BIOS boot sequence sticking around for so long is an unfortunate consequence of it becoming a decentralized standard outside of any one vendor's control, and so the only way to make it all work was for vendors to agree, and the solutions wouldn't be obvious or trivial in most cases because that boot sequence is incredibly primitive and full of assumptions coherent in a system with two floppy drives and maybe a disk if you were lucky.

But I'm sure the bad blood was measurable, especially for the higher-ups.