Intel also developed a track record of only being able to do a good job on one x86 design at a time. Doing Pentium M and Pentium 4 at the same time didn't work out so well, and neither did Core and Atom. And then for a several years the number actually dropped to zero as they had to keep recycling their existing designs and couldn't get a successful post-Skylake architecture out the door. Now that they're shipping both Core and Atom lineages on the same silicon, they might do a bit better at not leaving one to fall into irrelevance.