I’ve never had a problem with their butterfly keyboard since their release. I physically don’t slam my fingers on the keys to type, or work in filthy environments either.
I have a friend that types hard, though, and he’s had issues. He’d also eat while using it. Once it was fixed, he spilled a little water on it. Fixed it again, and kept wiping his oily face, then typed on it, then ate chips around it, and had to be opened up a third time. Those keys were slick and nasty.
I can see how they’re fragile at times, but I don’t think Apple went into the design process thinking the general user base of multi-thousand dollar laptops would be clumsy, slamming-to-type slobs, so in a way it is indeed an oversight made by the design team.