The officials can still gig you; first by making the close call in favor of their team so that there will have to be conclusive proof to overturn, and when there is conclusive proof the review official can just say it's not.
Plus, they can always call whatever holds and other non-reviewable calls they want to.
Bottom line, even with the review, officials can still gig you; it just takes them longer.
All the review is doing for teams like us taking up time.