As long as Siptah gear maintains the power advantage and is a separate paid dlc, it is p2w if server transfers are allowed. Yes it’s pvp, PvEC only thing but it has to be taken into account. Transferring naked is also p2w with the RNG aspects of Siptah. Your EL character has significant advantage in Siptah when you recipes are all available and you don’t have to grind down the hours of play to obtain them