Yeah you're on point mate. There are different gambling games which also implies that all games cannot be the same. There are games were you need 100% luck with no skilled strategy applied and there are games where you need some knowledge and analytic skill to stand a better chance of winning. Let's take football as an example, irrespective of the fact that you need luck for the game to fall to your prediction, you also need to have a level of knowledge of the ability of the teams and players, to know how well they can defeat their opponents or the outcome of the match.
In football there are many more factors that can affect the outcome, this list can be continued with injuries, starting lineup, motivation for the game, and even things that can affect directly during the game, like a red card or even referee errors. So, among other things, you should always know that you will always need luck, even in football. And there are slots in which you just need to hope that you will be in the percentage of players who are lucky enough to get the winnings that the casino allocates for winnings in this game.