It would come down to whether or not they can tell it's been opened. Note that they're using pentalobe screws on the bottom. These are used by Apple for non user serviceable parts. These are anti-tamper screws. If you strip them with a cheap driver, it's possible that it will be difficult to get your machine serviced. If you went past pentalobe or triwing (Y-type) screws on your prior macbook pro, that was no different. Anytime you see anything beyond phillips, slots, or torx screws, it's not meant to be taken apart by the user.