Will lack of GTINs hurt Shopping Campaign?

Hi everyone. I've been running a shopping campaign for my wife's apparel brand since last August. (She has a DTC Shopify store.) Results have been fair so far with a $40/day budget. Her products do not have GTINs yet, and buying them would cost $2,500. Would there be a noticeable improvement in campaign performance just from having GTINs? Do they also improve organic search results? I'm trying to decide if this is an urgent need or an investment we can consider later. Thanks for your help.

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