"State-of-the-art digital" is inextricably linked to the algorithms. Analogue becomes digital (recording) and again analogue (playback).
Very high-quality mathematical models improve analog playback.
Which leads me to
HQPlayer. I can understand the criticism voiced. The setting options are not self-explanatory and very complex. On the other hand, the algorithms are simply excellent.
In addition to the well-known possibilities of upsampling and format conversion PCM and DSD, in my experience you have to
choose the right filters. My recommendation is to operate the DAC in NOS (non oversampling).
Choose a filter from the group poly-sync-lp
(linear phase) to improve the space. They belong to the FIR filters and work in the time domain. Recommended for classical music and for music recorded in the "real world" (concert hall).
Or choose a filter from the group poly-sync-mp
(minimum phase) to improve the transients. They belong to the MinPhaseFIR filters and are particularly suitable for rock / pop / electronics, as well as recorded in music studio.
It took me a long time to familiarize myself with the HQPlayer. But why should it be different digitally than analog? How much time and effort do owners of high quality turntables spend? Some try multiple tonearms. They regularly check azimuth adjustment, align the cartridge and wash Vinyl.
But with digital everything should work as soon as you switch it on? It's not like that!
Hearing digital really well means a lot of work.