I agree with this! I have an OTTB who is half blind and spent 8-9 months on stall rest. She is now terrified of riding outdoors and just about any noise or movement scares her. I have tried ground work and bringing her back up slowly since August and things have gotten worse, not to mention any time she has to stay in her stall we take 10 steps backwards. I don't believe using ace for every ride forever is the answer, however using a small dose to take the edge off and let her realize that she is okay I do believe can be beneficial to the horse to help their brain take a second and let them learn.