Thats not quite true. High end dacs can sound very different and make more difference than an amp. Something like May will sound very different to Wandla or Dave. Yet alone summit fi stuff like higher end lapizators or something like wavedream signature balanced.
The headphone will make the biggest difference though.
Interconnects and power play a huge role too. Unfortunately desktop systems tend to be a much larger time and money sink than mobile.
The celling is much higher too. With IEMs its possible to reach the "endgame" around 15k (and there still will be much much cheaper dap / iem pairings that arguably sound better to you) with desktop rigs 15k is just the beginning with many objectivly much better sounding systems that are always on the horizon.
The headphone will make the biggest difference though.
Interconnects and power play a huge role too. Unfortunately desktop systems tend to be a much larger time and money sink than mobile.
The celling is much higher too. With IEMs its possible to reach the "endgame" around 15k (and there still will be much much cheaper dap / iem pairings that arguably sound better to you) with desktop rigs 15k is just the beginning with many objectivly much better sounding systems that are always on the horizon.