Back when the Yamaha was built, punched toerails were intended as mounting points for sheet lead blocks but not usually for the primary genoa or working jib. Typically lead blocks for the spinnaker guys (twings) were lead to snatch blocks on the toerails. Similarly, preventers and 'short sheets' for the jibs were lead to the punched toerail. That was the norm.
The downside is that the aluminum rails (and sometimes the adjacent topsides) get pretty beat up using them with snatchblocks
Now then, upwind, for the most part, on boats that size, genoa sheets were lead to deck mounted tracks and blocks, and then back to the winches.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay