These are my Mizuno Enerzy. They are only a few years old, but they survived my 110kg to 75kg, 5km in 50 mins to 10km in 55 mins fitness journey. Its getting a bit embarrasing at the gym when people see the duct tape. Ive already stitched the holes up three times.
How long are running shoes supposed to last you? They are expensive! Are they expected to do this, or should they last much longer?
You got alot of answers already. After they have passed the life as a running shoe you can still use them as a regular walking shoe, gym shoe, casual whatever.
Don't throw them away just because someone they only last 700-900km as a running shoe.