While I agree that Disney is exaggerating waits (adding to the "fear" of missing out on attractions, forcing families to consider purchasing Lightning Lane), I don't believe Disney is intentionally reducing efficiency in attractions with the intention to increase waits.
Complex attractions like Radiator Springs, Rise of the Resistance and even Hagrid's are notorious for not being operational at park open, unfortunately causing a delay and making standby waits longer than they should be at the start of the day. Rise unfortunately is the probably the worst at this, as I myself have encountered highly exaggerated posted wait-times, only to walk on to attractions. But the attractions are operating as they always have, with the exception of a few thata haven't been maintained well over the years like RNRC and ToT.
Wait-times have been exaggerated at some attractions to "hedge" technical issues and the ridiculous amount of lightning lane's they give out to those who buy it, guest recovery and DAS use.
Not defending Disney, as I'm pretty vocal on the exaggeration of wait-times, but I don't see any evidence of them intentionally reducing an attraction's operation to be inefficient.