ya. they dont. but you can kinda just figure it out when theyre saying "left" or "right" because you are seeing the action unfold. its not like we're listening to the match on the radio, we're watching it on twitch.
if the caster says "froyo are taking this super aggresive through left her giving ascent absolutely no room to breathe!!!" while the camera is on Ascent Roamer going for spam rockets to get a force on the medic who is on the right from that perspective, the cast viewer just kinda goes "yeah thats where froyo is pushing". if anyone goes "LOL thats top RIGHT lmao stupid caster doesnt know his lefts and rights" then they just have 5 brain cells idk man it really isnt a big deal