Build Sheet Life

I’ve completed about 300 hours of printing, exclusively PLA on the engineering side at 55 degrees C without glue (I hate glue). I’ve now noticed little specks of the build plate surface are pulling off and I can see the shiny spring plate. How long can I expect the build surface to last? Has anyone else encountered this?

I have the HT plate too, but I really like the texture the engineering side produces. I know this isn’t a recommended combo, but it has been working well for me.