While some users have surgically clean workspaces (there’s a thread on that) and use their computers only there, a laptop is, by definition, a computer that can be used anywhere. Not only clean desks.
This is the abuse my laptop gets: Your fans running the whole time...clean your Mac!
So, having a keyboard that implodes at the sight of a dust speck, makes a laptop unusable for me. Apples are expensive computers and they repeat often enough that they are “best quality”. With that keyboard, they weren’t. At all. That keyboard prevented me from upgrading my MBP. Knowing how I abuse hardware, buying a new Mac wouldn’t have been an option. During the “butterfly keyboard”-phase I would have bought a Lenovo to use on the road. I would have missed macOS every single day, but I can deal with that better than living in constant fear of the keyboard failing if a single speck of dust decides to approach it.