Matches like this is for fun cus the two side loses or earns nothing even with their point lose or gain. They will remain in their position or if worst comes to worst, they fall further. It's more bitter when viewed from Southampton's side as they will be kicked off EPL next season.
This match remains an important match for Brighton, so with Brighton's good performance, of course this match will be won by Brighton. The reason I say this match is important for Brighton is because Brighton's position can still change, because Brighton also still has several postponed matches which of course is an advantage for Brighton to be able to finish above Liverpool.
So yes, I don't think this match will be an unimportant match, but if you point it out only to Southampton then it might. Because after all, Southampton doesn't have good quality this season and comparing it to Brighton, then of course Southampton has no chance of winning and or only holding a draw. Because of course, Brighton will definitely get three points in this match.