this a great question
looking forward to hearing more on this one
my short answer is fly reels are like sports cars or luxury watches...do you need the highest end product out there? probably not. but if you want one, it it's available.
trout reels, 2-5 weight are a matter of taste, but 6-12 and higher require a good drag system, with the salt water reels requiring something smooth, but with truck stopping power.
the new allen alpha II reel is an example of a great salt/big game reel that is a great buy, but also an awesome reel.