both put busy work (which some enjoy & others do not) in the way of the activity you want to do
Busy work is purely subjective.
The definition of busy work is: work that keeps a person busy but has little value in itself.
Now if you talk about monetary value, all computer games are just a load of busy work. But I see value in many different ways. Enjoyment being probably the most important one in computer games. If you enjoy doing something, it is of value to you, therefore it cannot be busy work.
Now if it holds no enjoyment to yourself and you don't get anything out of it at all, sure call it busy work, but it is only busy work to you and the people that feel likewise.
I personally enjoy the FSS (not the actual mechanics, these are pretty standard among most gameplay mechanics so I have no real feeling on them) it's what I get from it that I enjoy. The mechanic itself is secondary to what I see when I use the FSS.
Most people complaining keep talking about it like whack-a-mole, not realising that the old ADS and flying your ships to planets is not very different. It's just a long drawn out version of whack-a-mole, but at the end you didn't even get to whack the mole yourself as the computer did it for you (not saying you have called it that as I can't remember, I just find those sayings as means to make the new mechanic look bad is just a wee bit silly as they are also describing the old mechanics too).