4,000-year-old 'Seahenge' in UK was built to 'extend summer,' archaeologist suggests

This archeological theory seems like quite a stretch.

Has anybody considered that the structure was intended to be some sort of beacon to boats out on the water? Without GPS, compasses, etc., finding one's way across the water, or back home from far out in the water, could use some helpful guidance on occasion. Building something high makes it visible from longer distances, especially if there is some sort of lighted beacon at its top.

My first guess would have been that this was an early and rudimentary light house type structure.