Why is people always concerned about lowering the barrier to entry just because they felt dismotivated by it? Reviewer's time is a commodity, especially in a p

Why is people always concerned about lowering the barrier to entry just because they felt dismotivated by it? Reviewer's time is a commodity, especially in a project like the kernel, accepting new patches is not a process that scales well when you receive thousands of potentially low-quality patches. It's a tradeoff, you get less patches but the reviewers can actually focus their efforts in accepting them.