Yet all cars exclude tires from their warranty. So unless the tire is causing accidents you'll be left high and dry if your tire is wearing out quickly, offers poor traction, fails to hold air well, dies too easily on potholes, etc...
The simple solution isn't "putting on a conventional keyboard" as there is no such thing as a "conventional keyboard" for laptops. All laptops have custom keyboards designed foe that manufacturer for that line or revision of the laptop. As a result, Apple would need to design a new keyboard for the MacBook Pro which would require a redesign of the entire machine assuming you're of the opinion that the problem is purely key travel. And that is assuming that the problem is actually a travel problem and not due to warping from heat stress or something else...
Just like a car... They can't just "put wider tires on it" if you're complaining about traction...
Obviously, Apple needs to get to the root of the problem and fix it fully. They also need to ensure that users who purchased machines like the 2018, which includes me, aren't left high and dry if their KB has an issue. Thankfully they appear to have done this... I'll hold judgment for others who have had issues to report back on how well the 3rd Generation Revision 2 keyboard is.