All laptop manufacturers have relied on Intel for years. That was fine when Intel was competitive. But now all those manufacturers are massively behind. They can either wait for Intel to catch up (unlikely), switch to AMD, which is better, but still behind, or they can try to move to ARM. Though that's really hard since they're relying on Windows.

Really this is a massive miss from Microsoft and their partners that many saw coming years ago. It's obvious that this is precisely why Apple likes to bring tech in-house. To avoid depending on something that isn't competitive.