Keep in mind, the politicians appointed by politicians isn’t just one person deciding. It’s the state’s legislative body. If it takes a 2/3 majority, the person really isn’t going to be a partisan hack. It has to be someone both sides really agree on. And there will be times they cannot agree on anyone, like when there is a really divisive issue of the day, for example slavery.
I think the result would be, fewer bat**** crazy senators, except in the most fringe states with legislative super majorities. It would also guard against mob rule. And help get money out of the senate. They wouldn’t need to constantly fundraise if they were appointed.
As the others have said, the reasons given at the time were selfish. Much like reasons given for stupid **** like the PATRIOT Act, they convinced people that the problems that existed were all going to be fixed if they just do this one thing.
Yes, I see that it is more than one person deciding - but just to play devil's advocate, what if it was the current House picking a politician for some imaginary reason? They are more than one person. The majority are bat**** crazy and just as stubborn. The only candidates with a chance would have to be bat**** crazy. It is very conceivable that no candidate could ever be approved by 2/3 majority. The position would remain vacant.