Fasteners are about the system and its application from design/materials through maintenance and assembly/daiassembly. No magic metal or design.
A friend took apart the steering gear in a 30 yr old sailboat this summer and said he was surprized no problems because it was all aluminum - gear, bolts, nuts etc. And then he would replace the bolts with stainless because it was stronger
No need.
For boards I think good old 316 and brass is pretty damn good. Needed a footstrap in a pinch and grabbed one from a 20yo windsurfer, mounted with stainless into brass, sitting for > 10 years.
Used in salt water for 10 before that. Ridden hard and jumped hard.
Titanium is cool but i don’t know the point except saving 5 grams. All-stainless needs care and grease. Beware crevice corrosion.