I was part the of people who questioned the viability of HOTAS vs K/M for dogfighting in previous threads. It was because I went and got a Saitek X52 HOTAS in anticipation of Squadron 42 and Star Citizen release. Set it up on War Thunder and found myself totally gimped fighting against K/M users even in Real History Battles (Simulation mode). I know that War Thunder and Star Citizen are two different games, however their skill sets overlaps quite a bit.
In War Thunder, K/M have huge advantage because K/M have trainers built into the control scheme. K/M have an automatic turning/banking limiter that prevents you from stalling your aircraft. On the other hand, if you go HOTAS, there is no such computer limiter. This means you often stall your aircraft out and plummets out of the sky and need to recover from it manually. Even if you tune your joystick to max/min joystick sensitivity so you don't stall, it was impossible to keep it tune for every aircraft due to the needing to change aircraft often. Therefore, you just have to rely on sound and hear your airframe shake and rattle to know when you are near stalling. K/M users don't need to do such thing, they can just point the opposite direction and do a 180 and let the computer controls all rudder, aileron, elevators, all that for them at minimum turn radius.
Furthermore. K/M users can just use the mouse to point and shoot. Anywhere they point the mouse, the aircraft auto calculate all flight surfaces to meet that flight vector demand. As a result, K/M were very effectively at sniping you out of the sky from farther distances. Not to mention amazing twitch shooting ability the mouse allows you to do on a fly pass. HOTAS needs you to control yaw and roll separately to point the nose of the plane to where want to fire, twice as much effort to achieve the same goal.
The most advantageous thing K/M have over HOTAS is view hopping. K/M users always just fly in 3rd person for maximum awareness. If they requires finesse, they just hop into first person. With the mouse you can also pan the camera very quickly to look behind and under your aircraft whilst avoiding incoming fire at the same time. That is very difficult to do on HOTAS.
What was the advantage HOTAS has over K/M? I found that for complex maneuvers, HOTAS was the way to go. Such as purposely stalling to bleed speed faster than K/M since they can't stall on demand as easily as HOTAS. SC is in space and speed management will be a whole different game so I don't know how HOTAS will have an advantage.
I haven't got a chance to play Arena Commander yet, but from what I see, I predict Arena Commander will suffers the same fate when people find ways to max/min the game play. K/M looks to be the king despite some beginning awkwardness. Even now in this thread, you see people fly in third then view hop into first person to take shots at the Vandul Scavengers. Not to mention with the K/M control scheme, the spaceship is slaved to where ever you point and shoot. I have seen a video of one guy despite not knowing what he was doing, point and shoot the Vandul down with less effort compared to one guy who uses HOTAS. With mouse you just have to point and the auto aim engages for quite a big area on the screen. With HOTAS, you have to align the whole spaceship near the center reticule before auto aim kicks in. It's hard to beat point and shoot.