and before anyone says the quote isn't about the saber route specifically, this quote is about the central conflict of the saber route that people have criticized for literal decades. that people have hung over shirou's head for decades. and we all saw how people reacted to fsn 2006 shirou which kept all of this.
or the stans that whine everytime someone complain about shirou when reading the vn
nasu is criticizing that specific aspect that fans have tried to defend for years when not even nasu agrees with how he wrote it and claims it was bad writing. it's the main part people can't stand about the route to this day.