You should seek help If you really think Algaia is more engaging and less boring than spamming a different DT dungeon every 2 lvls imo. I do believe that every dungeon except the first one has more mechanics that require you to pay more attention in comparison to algaia.
But thats not really the point. EXP gains are too high. Players that rarely log in have already most if not all jobs at 100. This doesnt only apply to Algaia but also to Bozja. Which is probably the reason why the new Zone is not made for alt leveling like Bozja.