Well Artist, Summoner and Reaper most likely won’t appear for the next appearance seeing that Summoner is another Mage. They are releasing Arcana (Mage) today. If anything, Scouter might be the class that’s coming in September. So you won’t have to worry about not having a powerpass for Artist/Summoner and Reaper because the following release will have a powerpass dedicated for that release which might be much higher than a Punika Powerpass and a higher Hyper Express ceiling. Any Lost Ark players will know having an extra T3 alt (that you may abandon later on), is literally the norm. Doesn’t hurt to have more T3 alts tbh. A day you’re bored you can hop on and grab a chance of Boss Rush/Cube tickets in Chaos dungeons that help your silver/gem generation. You literally don’t lose anything.
Just dont use it if you dont want to play any current classes. You will get a new boosts with new classes and even if you dont, just spend some gold for knowladge transfer and hone the char yourself. It takes like a week to get to 1302 nowdays.