I think you need to reconsider the things you're saying. "A couple crumbs" rendering a key useless is a problem, not something to hand-wave. And yes, the issue

I think you need to reconsider the things you're saying. "A couple crumbs" rendering a key useless is a problem, not something to hand-wave. And yes, the issue is widespread enough that I've read several blog articles, stories, and comments on several websites about how terrible the keyboard is. This isn't some cheap $20 keyboard part that is expected to fail; this is Apple hardware, frequently claimed to be the best in the business. Why "you" in scare quotes? Do you think people are lying about their problems with the keyboard? People don't want to bring in their workhorse machines (MacBook Pro) for repair because of a couple of crumbs. They don't want to be faced with repairs into the hundreds of dollars. They expect the newer MacBook Pros to be as reliable as the old ones, and this isn't happening. Why are you so sure the keyboards will "continue to improve" with each generation? They haven't. The current trend is that they're getting worse. Have you tried typing on a hard, flat surface for a lengthy period of time? It hurts. Fingers were not designed to bang against unyielding surfaces for hours on end.