Why is the Speaker of the House 3 in line to be PoTUS, but the Senate has all the power

[PSPS]

2. The last three years demonstrates that the senate has far more power

Although impossible to achieve, the senate should just be abolished. Some senators have even admitted as much. The house originates spending along with other bills but, without the senate's approval, they go nowhere. Moscow Mitch refers to himself as the "grim reaper" because the senate is "where house bills go to die." Further, the senate can (and is) frantically packing the courts and confirming criminals and foreign agents to governmental posts, and the house has no say in any of that.

Also, every state gets two senators regardless of its population. Wyoming, for example, contains fewer people in the entire state than any medium-sized city. Yet is still has two senators (Wyoming's population is 1.5% of California's, just 12% of Los Angeles alone!) So, in essence, the senate's very existence enables minority rule in the US.