There will be weeds coming up with the pine straw or any other mulch....including stones both with or without weed mats.
It takes a regular maintenance of pulling and or spraying to keep beds weed free.
Unless you do not like the red stone, it is the more expensive, most durable mulch....with weed maintenance remains attractive. No annual replacement. No attraction or containing of bugs and other critters like pine straw.
It is an individual choice.
So if you decide to remove the rock, repair and or replace the weed mat before adding the pine straw. It does help with the proper maintenance.
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