All audio from the audio tracks of DTS HD MA, DTS:X, TrueHD, translates to Dolby Digital. With loss of sound quality.
My receiver sees DTS-MA when played via an NVidia Shield. The Dolby Digital recoding is an Apple TV "feature" unfortunately. Infuse may have a workaround, but see my comments below.
Although I also wish to hear the original DTS-MA it is a contentious point as to how many people can actually tell the difference. See the heated discussions about "lossless" audio and those who insist that people that 256 Kbps is quite sufficient.
Dolby Vision 8.1 and 8.4 profiles. Playback ISO images and the structure of BluRay/DVDs. Licensed Dolby/DTS audio decoders. All of the above is not available in Plex. And this is a very important functionality.
I'll accept your statement about profiles at face value. I have had no issues with any of my 600 or so MKV's not playing Dolby Vision (when available) via Plex so why is this relevant? I did read the reference about the profiles but it does not say why I should care.
As for Blu-Ray Extras they are handled quite nicely by Plex "featurettes". Have no interest in preserving the structure of the original Blu-Ray. I want to manage the various supplemental videos on a disk so have no interest in .iso files.
Don't undertand the point about DTS decoders.
Assuming your statement about DTS-MA in Infuse went to verify in Infuse my Apple TV. Failed.
1. Infuse main menu took forever to populate
2. Tried to play a movie and just got spinning gear
Likely a setup issue but almost never have that issue with Plex.
3. In Plex for "Bumble Bee" I can ~17 subtitle choices and ~16 audio tracks on the main film page. Didn't see those choices in Infuse.
4. In Plex I use my scanned movie covers to serve as the movie thumbnail as it allows me to see the resolution, edition, whether there is a digital copy, and the back cover of the slipcase. Helps me identify the content source.
Some of these issues might be due to my inexperience with the app.
I am in the process of upscaling my DVDs to 1080p via Topaz. [It makes a big difference in video quality]. Simple thing to do with help from Plex. Sorting my Movies by bitrate allows me to quickly identify them. Don't know of a way to do that in Infuse.
We care about different things in our video player.