Definitely can be a skill, however most of the time you're faced with endless repetitive tasks in order to level up your dudes with little/no strategy required. That's not strategic gameplay, it's just grinding. If you're talking endgame/metagame scenarios, then that's what you're grinding to get to, much like how people would say Pokemon/WoW "really only flourish in endgame", which is to say "You're going to spend hours of your life doing boring shit to make your characters good enough to survive endgame" rather than "You can play when you are good enough".
Basically you will always choose the numerically most advantageous option to you, strategy/skill comes from being able to identify what is most advantageous at that time and understanding trade-offs. The more removed from direct control a game is (in terms of system, not in terms of the game just arbitrarily doing whatever it wants), the closer you get to something where there is mathematically a perfect option. Connect 4 and TicTacToe have been solved, there are mathematically proven ways to beat those games 100%, but you can't ever 'solve' soccer. You can't even accurately predict soccer, even with statistical tracking, and even if you know the statistically best options to you (shooting close is better than shooting far, etc.). It will always be more beneficial to use the gun that shoots the bigger numbers (if that is the only variable regarding the guns), but player movement, accuracy, etc. all make it more about the player's abilities rather than the player just saying "I'm going to press A to cast fire 2, because I ground out 6 levels before this fight so it's better now."
tl;dr - direct human control gives unpredictability and feedback necessary to make something less predictable, whereas turn based games devolve into "I'm picking my best move (for this situation)". Metagaming is slightly different, but only in that it's a step higher in complexity. That's not to say it's 'bad' and there isn't strategy, just to say that getting there takes time and grinding. You can't level 100 a party of 6 mons with perfect evs and natures without insane amounts of grinding.
still tl;dr - Direct action is orders of magnitude more complex than turn based grindfests, which makes them less predictable and harder to strategise.
The can either be fantastic hybrids or complete dogshit with the worst of both worlds depending on the developer and your taste. Some people love Dragon's Dogma and think it's the holy alliance of stat based action gaming, some people think it's a wanky grindfest where player input just makes it take longer.
I said as much above (>>11626976). Grinding can be enjoyable provided the core gameplay itself is actually fun. If all you're doing is wasting time so your character can grow up enough to do what you already could do with your current skill level in a game system you are no longer enjoying specifically because the repetition has destroyed your sense of what fun even is, then it's terrible. I enjoyed Destiny simply because the game felt great to play and it didn't feel like a chore. At first.