I was out on my SS Raleigh today and during a long, gradual uphill with a light crosswind I decided that when I'm in the mood for single speed it's the inevitability that I like. The bike will not be adjusted to conditions, and no matter what may arise its demands are unchanged. What remains is simplicity itself: I either can or I cannot. Will or will not.
This is also why I'm usually out there with derailleurs.
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera