No worries about it being an issue in the long run, it is purely visual and it will not affect the longevity. It's up to you if you want to exchange them or not.@lurker33 @Fenners81 @ike_hiking_boots , thank you so much for your comments.
Could you please also suggest if such defects affect the shoes' longevity and overall quality, or is it purely on aesthetic grounds and holding shoemakers to account that such things are deemed to be a no-no?