The purpose of practicing the Second Dharma Seal is to develop renunciation. This renunciation is the genuine intention to be free from suffering in the six realms of rebirth in samsara, not in pure land. Hence, whether there is suffering or not in Amitabha pure land is irrelevant to the actual practice. We only need to understand this point.

~Depicted from THE FOUR SEALS OF DHARMA - All Contaminated Things are Unsatisfactory