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I haven't played any of the other games yet so I can't say how it compares, but RP consumption isn't much of a problem. One RP-restoring food is available from the start of the game, and can also be made from purchased ingredients and sold for a small profit.
There aren't any items to restore your golem's RP, which limits ocean travel and sea monster battles at the start of the game, but it's not too bad.