We walked without gaiters during our first
camino frances in 2015. There were several days of heavy rain and our boots and socks were drenched. For our second CF in 2017, we bought gaiters. It rained during the days we hiked into Zubiri and Pamplona and the gaiters kept our feet dry. The rest of the camino we had clear, blue skies. We didn't complain that we carried our gaiters with us!
I had a feeling that we would face lots of rain during our third CF in 2019, so we brought our goretex jackets, gaiters and also rain pants for both of us. Our prediction was right; during a few stages in Galicia, we hiked in non-stop rain for more than five hours. The gaiters and rain pants kept our boots and socks reasonably dry, but our goretex jackets could not withstand the torrential rain and we were soaked. For our CF this fall, we'll bring the same gear and have also purchased light weight ponchos to wear over our goretex jackets in case we walk in a downpour. We're not concerned about the added weight. During our last two caminos, my wife shipped her backpack ahead and wore a day pack. Having walked three caminos with my backpack, I plan to ship mine ahead this fall and walk with a day pack. Bob