When they dropped the Preset Settings exactly, I’m not sure. Dolby Atmos and DTS:X kinda’ screwed things up there. You cannot cross up mix them with few exeptions. I remember being able to apply DTS Neo:6 Cinema to Atmos tracks using the Yamaha. But, that is an older mode that doesn’t deal in height or virtual height speakers. The Yamaha also allowed for Center Spread to be turned on with atmos tracks while the Onkyo and Denon did not allow for it.
Regarding the Onkyo TX-NR6050, DTS Neural:X and Virtual:X cannot be applied to Dolby Atmos tracks. But, you can get around this if height/virtual height speakers are turned off. The metadata is not flagged and the track, in the case of a blu-ray disc, is simply recognized as a Dolby TrueHD track rather than a Dolby Atmos/TrueHD track. Without the metadata flagged and Atmos displayed as the input, DTS modes are now selectable.
DTS:X tracks work a bit differently. Turning off height or virtual height speakers does not prevent metadata from being flagged as it does with Dolby Atmos tracks. The receiver still recognizes and displays DTS:X as the input codec and Dolby Surround mode cannot be selected for processing like it can for DTS HD Master Audio tracks.
Atmos tracks using an Apple TV 4K are different, still. They are delivered using Dolby MAT. Basically, Dolby Digital Plus lossy core is converted to PCM and metadata is still attached to it. Some receivers briefly confuse it with lossless TrueHD and then sort it out. The Yamaha and Denon displayed Atmos/PCM as the input while the Onkyo simply displays Atmos. As with Atmos/Dolby TrueHD on disc, DTS modes cannot be selected with Atmos/PCM tracks.
Turning height or virtual heights speakers off while playing an Atmos track on the Apple TV 4K does not result in loss of the Atmos flag like it does with discs. If one wants to use DTS sound modes with these tracks, they must go into the audio settings of the Apple TV 4K and turn Atmos off. DTS sound modes will now be available with the PCM track.
Streaming in DTS is practically a non issue until Disney+ applies it to their IMAX Enhanced titles using some form of DTS that nobody has identified for sure, yet. Sony Bravia Core service is, I believe, the only service using some form of DTS. I’ve yet to hear from anybody who has used the service. Most streaming devices and new TVs do not support DTS at all.