On the contrary, I was one of many who breathed a little easier voting for Harris because he was on the ticket. The general wisdom is you choose a VP that scoops demographics that the ticket head misses. Just because you don't care doesn't mean no one does. I'm sure Vance scooped a couple shy demographics for Trump.
I like Walz. My leftist Minnesotan friends like Walz. He's a likeable guy, he seems remarkably leftist for his demographic, which is the highly electable "old white dude". The people who care about VPs will care that it's AOC, and the people who don't will see a friendly, straight-shootin' white dude. Have a sense of strategy for Marx's sake.