DD+ to DD conversion on the optical port.
Only reason I bought the Roku 4 was for the Opti out. Didn't even occur to me that ANYONE would put out a 4K supported device that included OptiOut but does not have DAC capability. The product is useless without it, and I feel misled. I don't even see this listed among the top feature requests under the first post and it has been routinely requested since October of last year (I consider this not the same as "DTS-HD & TrueHD passthru"). Is it going to be provided or not.
Along with many others I too have been requesting DD+ to DD transcoding on the optical audio output of the Roku 4 since last October. The engineers who decided to add an optical port to the Roku 4, but failed to see how useful DD+ to DD transcoding would be for compatibility with not very old receivers that only understand DD, missed a great opportunity to differentiate the Roku 4 from both Apple and Amazon's newest players which dropped optical audio outputs which did provide DD+ to DD transcoding for backward compatibility with older receivers.
I too am dismayed and surprised to see that "DD+ to DD Transcoding on the Optical Audio Output Port" is not even listed among the list of prior top feature requests. There are several threads with active posts ranging from October to this month still seeking this feature.