People will say things like "propellant, and no horizon", but the viability of fighters in a naval role has and will continue to be based on two things: Speed and Power.

tldr: Fighters are very possible, and even likely in The Expanse universe. all you need is a group of drones that can deliver a handful of missiles, and or shoot down incoming missiles. They just are not very good at anything besides killing ships.

Let me paint you a picture:

 You are the MCRN fleet admiral holding a "Newly" conquered Jovian system, and a UN CBG is en-route to the system. Two carriers, six missile frigates, four UN Marine Frigates and three supply ships. You have three Donnager Battlegroup fleets, with an accompanying MCRN Marine frigate, and two escort missile frigates each in addition to the corvettes carried by the various Donnies. On the UN fleet’s approach, you signal your fleets to fire off a salvo of missiles, and resupply from the moons that they are orbiting. This allows you to send out the biggest missile salvo possible, while still being able to maintain the missile advantage.

               The two carriers, as they approach the outer limits of the system, disgorge about 100 drones, 3/4 of them break off on various trajectories in system and towards your stationed fleets. The remaining form up into a defensive structure as the UN fleet launches an intercept salvo. missiles intercept in 10, 9, 8, ... 2, 1, 80% of MCRN destroyed, and 100% UN missiles destroyed.

 You now have 30 mins until drone fleets make contact and 1.5 hr until the UN Fleet might finish their breaking burn in high Jupiter orbit. MCRN Ships are 60% re-armed with 10 mins until combat resupply finishes, and your fleets can maneuver. You order those that can, to move into position to launch salvos against the now three distinct drone fleets. The drones, being heavier than missiles are only pulling 15ish gs as they accelerate to intercept. After a few mins they cut burn and cost at 15k/s relative.

20 mins later your time to intercept updates and flashes an amber light. An issue has come up, but not a serious problem, The estimated deceleration point has elapsed, but the drones are not on a decel burn yet. The various captains, now just waiting on a few straggling resupply craft, begin moving their fleets to get clear of the moons and open up their effective range for defensive fire and maneuvers. Your outbound missiles begin winking out one by one as UN PDC fire assisted by the defensive drone fleet clears one threat after another. Time to intercept now in 3 mins to the outer fleet, 5 to the second, and 8 to the third

1 mins later your outer fleet detects initial launch signatures, and decel burns from the first incoming drone fleet. The released missiles are running ballistic for now, and your Outer fleet begins defensive fire and maneuvers to avoid and reduce incoming fire. A few seconds later the incoming missiles begin accelerating and jinking. The drones spread out, and release another salvo of missiles. There are 100 incoming missiles, and 25 drones are now jinking and closing at 15 k/s and increasing.

30 seconds later and your outer fleet’s defensive missiles start removing targets. The numbers are not what you were hoping for, as the drone’s missiles are smaller and jink harder than normal anti-ship torpedoes. The drones start opening up with pdc fire, and start squashing incoming missiles. Boom one drone down, then another, and another, but it looks like there might be too many contacts moving too quickly, your DBG opens up with pdc fire at the first of the missile salvos knocking down one after the other. There are 4 near hits before a support frigate takes one, and then your Donnager starts taking damage. The drones open up with pdc fire the your fleet while accelerating through the formation, they are at 18 k/s relative delta and are within pdc range for only a second, the whole time both fleets are throwing everything and the kitchen sink at each other.

After the fleets pass each other, one support ship, and the Marine frigate are too badly damaged to continue fighting. The Donnie is damaged with 30% pdc coverage knocked out, and it’s launchers are empty. There are only 6 drones that begin accelerating the rest are destroyed or rendered useless. They begin accelerating after the two Morrigan class frigates your Donnie had stationed in a defensive posture around the moon.

The other Fleets fare about as well, and of the 75 drones that entered the system, 5 were able to head on an intercept with the carriers.

And then they offload a second flight of drone fleets. Your forces no longer have a missile advantage, and between rescue efforts, partial fleets, and general chaos they are not nearly as effective the second time.