We had a similar change on our trip back from Jamaica in December. Our connection in Charlotte, which included customs, was reduced from about 90 minutes to 40. We ended up getting delayed and missed the connecting flight home. We would have made it with no problem with the original times. Several people on other flights were given vouchers for hotels and meals, but we weren’t because we’d “chosen” a shorter connection and could have theoretically made the flight according to American.