That's probably what makes it so difficult. Maybe it's
No, I don't think Apple would have changed the hardware. When is last time that Apple changed hardware in the middle of a production run. You'll realize that was NEVER. They may still think after a year that people will either deal with it or the problem would disappear. But it hasn't. Sone brand new computers have the same problem the iMac Pro did a year ago. Think even short and hard about that and the answer is obvious. They don't know, don't care, cannot find a solution, and DON'T want to replace the defective hardware.
Everything what mreg376 said makes sense to me.
For the record, T2 chip isn't working in the exactly same way on Air and Pro.
And 2018 Air was already on process when 2018 Macbook Pro was released.
Apple set all schedule for 2018 Air, and of course, they didn't want change its entire design and and reassemble due to small number of T2 chip issue.
They still have no clear solution but RETURN (means more likely hardware issue)
Apple tries to handle with new firmware (still no luck) or suggesting disable T2 chip functions which don't make sense.