Not remembering past life(s)?

I wanted to ask how Buddhism explains why we don't remember our past lives? Why bother with the Buddhist path when we will not remember this temporary life in our next? I heard that for example contrary to rebirth in the human realm, beings who are reborn in the Pureland of Amitabha can remember their past life. Why bother practice other methods and not only just focus on reaching Sukhavati? If I won't remember the temporary "me" of this life in the next, why bother practicing at all? Isn't it better to know about my continuity in the next life for progression?