Hello people who don't play FL. Do play FL before talking about FL. Thank you.
No, FL does require skills, that is, mental skill or whatever. If you play a game of memory or something or other, the person who has "trained" or plays the game a lot will win, because they're better at memorization. FL in osu! shows how good a player is at mentally recalling patterns to their memory, and succesfully execute whatever they remember (aka. you'll miss even if you remember the pattern because you only recall the general position of a note).
Also, know how it's hard to do jumps with HD sometimes? It's mostly because the notes disappear, so you have to vaguely remember where that note was with your short-term memory, but you still see the note before it disappears, so most of the time it's not that hard. Same thing applies to FL, except in a lot of cases you won't see the note at all, making jumps even harder.
Obviously, playing FL comes down to grinding, but there is definitely skills involved that can decrease the amount of plays required to pull off the FC.
If this fits within the current pp system which values physical skills, I don't know, but saying FL doesn't take skills is false.
This is probably incoherent rambling, but you probably get the point.