Maintenance problems
I replaced a solid mahogany tiller on a '90 Mac 26 with a home-made replacement when the original started getting ratty, and also because I was concerned about the strength of it. I built a laminated tiller, 4 layers, alternating oak and teak boards epoxied together. It was bulletproof, breakage was not an issue any more, but maintenance was. Even with the best varnish I could find on it, the finish was failing after less than a year. I re-finished it, and had a canvas shop sew me a cover that covered all the exposed wood. That solved the finish problems. On an H-26 though, the wood section in between the rudder gussets would be prone to wear the finish off from movement, and covering the wood would require a fancy custom cover to protect everything. It can be done, but aluminum would be the cheapest and easiest.