Thanks for deep invesigation, kofa.
Finally had time to use/try ART with more patience. I have instantly fell in love with ART’s way of presenting RAW previews. ART makes it ultra fast. <2s on my intel i5-8, compared to DT’s 40s-1min of full loaded processor work. And “Black&white RAW with highlights” - what a genius and fast mode! 
Even faster than color ones. User can focus on details, luma and hihglights.
And ART’s jpeg preview derived from RT - instant and not adding artifacts.
The only way ART is lacking to absolutely perfect preview, is RT’s “on mouse hover” inspect pointing behavior.
@priort Thanks for presenting ART to me. 
Pushed me to reinvent whole workflow, but effects are worth it.
What is ART best of all RAW processors I tried:
- culling/previews
- demosaicing methods. Especially ultra fast and detaly IGV one - now my bird shots got their real feather back
- “texture boost” module - good as an input for further processing in DT’s contrast equalizer
- really working “highlight reconstruction”. DT’s one looks like nonworking compared to RT’s/ART’s, no matter Lch or color reconstruct -(A)RT’s one the only that can reconstruct penguins’ blinking white chests taken in full sun.
I now extract full-res 16-bit TIFFs form ART and load them into RT for further processing:
- color fiddling (now I experiment processing non-touched ART’s tonal output with DT’s filmic)
- operations with masks
- gradients (lightyears better than RT’s/ART’s GND filter)
- framing
- watermarking
- DT’s genius export profiles/options that I can set for web/competition/publication/print separately (only something like “sharpening after scaling down” is lacking in DT)