Have you read old thread in this forum like @Auburn suggested?
Like this one. Asian pears: eating and growing. Experiences and thoughts, please - #28 by galinas.
My experience is that when you let Asian pears hang until they were very ripe, their texture will become soft, not buttery soft and smooth like good Euro pear, though.
However, one main reason many people like Asian pears because of their texture, the crunchiness. Asking for soft, sweet Asian pears is quite like to asking for sweet but crunchy peaches. Definitely not the norm.