No doubt that if certain patterns are tied too neatly they won't be as effective as a scruffier looking fly. Many patterns are better if they show some movement, or life, in or on the water. Still, I've noticed that those scruffier flies from the vises of good tiers look better & seem to catch more fish than those tied by a rank amateur, but that might be all in my head.
There seems to be a point in a fly tier's development when they reach a level of skill that it becomes very easy for them to tie most any pattern. That comes with experience, no doubt. Of course, with experience comes training & practice. We can all learn to tie from books & videos but nothing seems to help one learn fly tying better than personal instruction from a skilled tier. No book - no matter how good it is - can replace lessons from a good teacher. Every time I spend some time with a skilled fly tier I learn a lot more in that time than if I were reading a book about it.
I do enjoy watching a skilled fly tier work. It can be difficult to see what they're doing sometimes - some of them work so fast. Take a professional fly tier - they'll tie more patterns in an hour than I will all evening. That's because they have to in order to turn a profit. Sure, they can take short cuts like laying out all their materials for the group of patterns they're tying before they start, but they'd still smoke me if I did that, too.
If you can get a skilled tier to show you a pattern & they slow down enough for you to follow them, it's like watching an artist work. Of course when watching them the tendency is to focus on the hook in the vise. Naturally you must do this to learn the pattern, but I like to watch other things too - like how they hold their tools, how they hold the feathers or fur, etc. Things like that can be really informative & help you to pick up on little tricks they do so well & have been doing for so long that they don't even think about them. In other words, I try to study their technique.
There are some big differences between amateur & professional tiers that I've noticed over the years. For one thing, good tiers seem to spend a lot of time just picking out the materials they're going to use for a specific pattern. When they're thumbing through a group of feathers I always try to ask them exactly what they are looking for - what qualities does the feather they selected have that made it better than the others? This is time well spent, I've learned, as it's easier to work with a good quality feather than it is to try to make a lesser feather do something it doesn't want to do.
Another thing I've noticed with good tiers is their economical use of the thread. They seem to tie better flies with less thread turns than me. It makes sense, too. Don't make a bunch of sloppy turns where one good, tight turn will do. I'm betting this has something to do with why they're faster than me.
So if you're lucky enough to meet a professional tier who is willing to slow down & show you the ropes, you're going to learn a lot faster than you would from any book or video. It takes years of hard work to get good enough to tie flies for a profit. While I've been tying for a good many years, I don't think they need to worry about any competition from me!!