Ship fitting is a bit of an art form. I've never done the math, but I'm certain that for each given ship hull there is a shit ton of potential fits. Most of which are absolutely horrible. But I wouldn't be surprised if any given ship can be fit a 1000 different ways, of which there are dozens of valid fits.
While I will repeatedly claim I'm horrible at theorycrafting, I have picked some things up over time and often when I come up with a fit that makes maximum uses of cpu/pg someone will just switch 2 mods around or downgrade something and make it better in no uncertain terms.
I think there is a big
rubber ducking element to fitting ships as well, fisty already hinted at this in a different wording. But once you have your fit you have to start questioning your fit because it's probably not perfect yet. Even after doing that I can assure you that no matter who you are, after showing it to someone they will point out something to improve it that will seem obvious in hindsight.
There's a reason famous people who post fits on their blog tend to add the caveat that you shouldn't take the fit as-is but take it as an example
It's because they know that as soon as someone reads it they will notice something that could be improved.
As for the FC'ing thing. That shit just takes practice. Everyone you see who seems to do an effortless job of it simply has had a lot of experience whelping fleets. While I think it's important for every agony member to be able to FC a fleet you will note that there are a fair number who rather hand off that lauded position to someone else. FC'ing is hard work, while the average member of fleet can read-up on some blogs or watch some video while navigating empty space the FC actually has to do shit. Check the map, check the route, wonder if he should hold a break soon, where where my skirmishers anyway, what alliances and corps might be active. etc.. Then as a kicker every mistake you make can potentially whelp the fleet, but if you do your job it was the scout the logi or the tackle who made the difference. The Exception here being if you pulled off some masterful tactical move shifting the balance heavily in your favour for any given engagement. But those moments don't tend to happen a lot.
Spaceships are serious business and as an FC you are almost a sort of project manager trying to balance your resources and keep everything on track. If the project is successful all the praise goes to the team, but if the project fails it was your responsibility.
However, unlike real world PM"s, the reward of an FC comes in the form of people having fun. Because while spaceships are serious business in the end it's a video game and people play it to have fun. As an FC you are a creator of content that your fleet mates AND your targets can enjoy. That's worth it's weight in gold, that's why people log-in and why people undock their ships.
I think we need an FC appreciation day now.