Yeah, most opposed rolls can be substituted by one bane for ordinary resistance (sneaking past alert guards), and two banes for extraordinary resistance (pushing past a minotaur). Some effects, like domination (mind control) still have a pure resist roll, so that's not included. Genuine contests, such as winning in arm wrestling, might still need a mechanic.
For domination i could see that you do as my previous examples, you could just make it so that when you cast the spell, you roll the casting of the spell with a Bane at 2wp, Normal at 4, and with a boon at 6 (essentially, how much of your power you exert to gain control over them). Or alternatively, that you make the casting a challenging roll (-7 at 2wp, -5 at 4wp, and -3 at 6wp). It removes the need to make an opposed roll, and you can flavor it that attempting to gain control over someone is difficult.
The issue i find with contested in this game, is that it is clear it is not outright built for such rolls. Npcs and monsters are meant to have small skill lists, and if they are gonna do something that for a player requires a roll, an npc should only roll if it DIRECTLY affects the players (If the party went out their way to find an expert on a particular legend, that npc shouldn't roll Myths and Legends to see if they do know, he just flat out "succeeds" and tells the party what they need to know. You should only roll if it is an attack that could harm, or an npc is trying to save you with a healing check), and really should only have skills for the sake of flavor, in case they are an expert in the skill and can serve as teachers, or are meant to be a noteworthy npc. But as a consequence, we are in this weird situation of not having the skills on the npcs and monsters for the various mechanics that is "supposed to have them".
And i would argue that you don't NEED to have contested rolls to make a challenge. If we take the arm wrestling contest, there are other ways that you could invoke that the person is strong, such as your making the roll with a bane, or if we take my suggestion, it might be a Lesser or Greater challenge to do. I have played a decent number of rpgs where the gm do not make any opposed rolls against the players, and instead the player is the only one who rolls their dice, and the gm decides how easy/hard that challenge is. And a lot of them work really well in that regard (I can highly recommend "Blades in the Dark" as an example).
Contested rolls works best in much more crunchy rpgs where the npcs have devoted stat blocks which do list all the attributes, stats and skills. But it is pretty clear that Free League wants this to be a more streamlined and simple rpg, which is why i think that opposed rolls, and similar "contested" mechanics don't work. It feels that they are tacking it on because it might be an mechanic from the older editions that is here for the sake of "It was in the older editions, so it should be here".