I'm stuck in the same relationship with them: MX Master 3s/4 is my perfect productivity mouse. Problem? The rubber coating gradually disintegrates and accumulates dirt. ERGO K860 is my perfect keyboard. Problem? The plastic ABS surface of the keys wears and smooths in just a few months. The first set of AAA batteries have a far longer life!

If only they didn't cheap out on the materials and plastic quality.