This is the way of thinking that pollutes this hobby. A manufacturer sells a DAC unit for €10K+ and we see people "it is great but you need a power supply upgrade, as the power supply in the unit induces noise". "DAC itself is great but you need to add a $10K clock to get the best performance". "It is the hobby, you just need to keep buying and tweaking".
If we were in the 1960's, I could have said "maybe", but these issues are all solved long long time ago and any design that lacks such basic things is a lot of horse crap, and deserves to be in museums, not on the shelves. The more this type of thinking continues, the more the manufacturers will keep repackaging the same stuff with small tweaks every year and keep pushing them to us with no major updates but a lot of marketing hype, without solving their mistakes.
When it comes to N30LE, I think Cayin honestly tried to bring out a device that packs everything with the best HW, though it is still for me just a repackage of everything they have done in one device - but still lacking anything revolutionary. Software is the same thing we had since the first Android DAP with some additional switches. It could have had the biggest influence on the sound, as the DAP has a very powerful SoC with a powerful DSP unit. Even a simple thing like a system level cross-feed isn't there. Except A&K, there is not a single DAP manufacturer that has it. An still, A&K's most recent TOTL DAPs have bugs that I reported during SP1000 - simple text rendering bugs. They have a system level PEQ but it is ancient! You can't even set s shelf, everything is peak. Interface is horrible.
Yet, these companies ask for €4-5K prices (here in the EU) and we, as buyers, think it is just the nature of the things. We just need to keep buying and keep tweaking - the reality is we just keep tweaking our minds. Something is wrong here.