4 years should be 10 years.
What is it about year 5 that causes a high-end computer to turn into something that nobody should have an expectation of successfully typing on?
I don't think the idea of offering a 4 year warranty is an admission that the expected lifespan is five years. If that keyboard lasts 4 years, there's a real good chance it'll last more than that if you don't abuse it. I beat the crap out of my 2016 MBP keyboard and broke one of the keys by abusing it (intentionally). The keycap cracked and broke off because I was hammering it so hard to see if I could get the keyboard to mess up. I conducted my mini experiment for a month after almost two years of ownership right before I had to take it in for new battery. The butterfly mechanism isn't as fragile as people think it is. Something else is going on. So if you're not having any problems after it's well broken in, my belief is that it's most likely going to be fine.
Good luck finding an real ten year warranty for anything, especially for something like a keyboard. Four years is a pretty amazing warranty for anything with moving parts that undergoes daily wear and tear. After four years of a product that gets daily use, you're on borrowed time no matter what. The keyboards on the pre touchbar MBPs aren't indestructible either. I've had a couple of those break on me before. The difference is that I was able to repair them.
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