IMHO...

The Full Windsor looks great with certain ties--ties that are silk or thin enough to make a neat, relatively small knot. Some bulky knit ties for instance, not so much.

And the Windsor also looks good with certain shirt or collar styles but when paired with a collar that does not spread as much as modern collars, it not only distorts the shirt but gets lost behind the collar.

True, not many shirts (or even detachable collars) are made in this older style ...la Belle Epoque...but there are still some around and still some of us who prefer that style of collar.

The point, though, is that sometimes the Windsor is just not appropriate and since the average man will see styles shift several times in his lifetime, it is always handy to know a few other knots--the Half Windsor, if nothing else.