The humble combo trial is a time-honoured tradition in fighting games. It's a quick and relatively easy way of trying out a new character, feeling out their general flow and kit in a low-pressure environment.
They are, also, fundamentally useless. The combos in question are rarely optimal, and often devolve into simply playing Simon Says a dozen times before throwing yourself to the wolves of online matchmaking and hoping for the best. I can't speak for anyone else, but I rarely retain any of the stuff I pick up during combo trials, and usually end up defaulting to the likes of Dustloop or trusted YouTube tutorials to figure out how to actually play a character.
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