yeah historically that’s the case, but trump also literally picked a candidate willing to overthrow democracy as well. I think it matters more this time, because historically VP picks are almost always swing state candidates, because they generally have a lot of pull in either direction. In this case, it breaks that norm, and i think as long as it influences voters enough now, and they continue campaigning together up until the election, it should help to energize voters quite a bit.
Walz is a really good public speaker, and so is kamala, having them play off of each other is only going to further improve things IMO.