People ask why I left roofing. Because I got tired of replacing decking that a forty dollar downspout extension would have saved. Most of what I tore off houses was not worn out. It was rotted out, from the bottom edge up, and in almost every case a failed gutter delivered the water that did it.
A gutter that holds water is quiet about it. You will not see the problem from the driveway. You will see it in the paint bubbling under the eave three years later.
Here's the thing about how the rot starts: it is rarely the gutter leaking through. It is water overflowing an inch behind the back edge, running down the face of the fascia board, and sitting in the joint where fascia meets soffit. That joint never gets sun. It never dries. The board goes soft from the inside, the hangers lose their bite, the gutter sags, and now it overflows worse. The whole failure is one slow loop, and it is preventable at the first step.
The free fascia poke
Ten minutes and a pocket screwdriver, whether or not you ever buy a gutter from me. If the board is soft I will show you exactly where, photograph it, and tell you what it costs to fix now versus in five years. Ask me to poke your fascia. I mean it.