I think I may understanding why some people think DSD is something not worth to try (again). Here is my experience with DSD...
I bought my first SACD player, Marantz SA15S2, for playing my first SACD around late 2000's
Based on my personal experience, I could't tell much difference between SACD and CD version of the same title. Back then, there were not that many SACD and they were pretty expensive compared with CD (at least 2 times the price of the same CD version).
Given I tried a few SACD titles and couldn't tell much difference between SACD and CD, I kind of ignore it and going back to CD althought I knew technically, DSD should be better.
I've been mainly listening to CD and 44.1k files for long long time as I don't have much SACD.
Then the Hi-Res digital player revolution happened. A lot of Hi-Res players started to appear in the market. Some players could play even so-call DSD files... For me, I didn't care as I only had a few SACD titles and no DSD files.
Around 2017, I bought my first DSD capable DAP, the Sony WM-1Z. At that time, I knew it could play DSD files but I didn't care as I used it mainly for 44.1k files. And I was happy with the 44.1k files.
I was mainly a Mac user. Late last year, I got a new PC (because I need it to run certain Windows only program). Having a new PC prompted me to think what else I can do with it given it's excessive power / storage.
These years, people has been talking a lot about CAS (which I didn't use). Hmm... I talked to myself that probably I should spend some time to understand it more and see what I can do with it with my new PC.
I started to use Foobar (yes, I just started using it for a few months); started to use my Sony WM-1Z as USB DAC....
As I didn't care about DSD in the past, I didn't know the difference between DSD64, DSD128, etc.
Over the last few months, I've been learning the DSD technology extensively as I think I missed a lot over the years about its development. Now, I know more about delta sigma modulation, noise shaping, digital filtering, etc... One day, I came across HQPlayer and it is a game changer to me. To me, I can really tell the difference between the 44.1k source and its DSD256 upsampled version.
Long story short, if you think you know DSD well and experience its sound well enough based on DSD64, I would suggest you to try it again (especially if you didn't try to compare 44.1k file vs its DSD256 upsampled version). Make sure that you compare the same source by upsampling the source file to DSD256 yourself.
For me, the DSD64 (i.e. SACD) experience really suggested to me DSD is nothing... ha ha..