How to remove harshness from my digital gear

I'm surprised nobody as ever discussed the use of DSP effects processing with computer audio files. For example, I have used an effect within Foobar called PSP Vintage Warmer with excellent results. Even while processing audio tracks on the fly, I have never experienced drop outs or pops and clicks due to lack of computing horsepower. In my experience, just tweaking some of the presets I was able to get remarkably close to the tube sound that I like while rolling off the highs to satisfactory levels to where my ears experience no loss in quality. I agree that jitter reduction is fundamental, however I guess you can throw a number of expensive cables, unorthodox tweaks and buffering devices at your setup but I don't honestly see how it's any different then just altering the file to your taste digitally. I also think that a clever enough developer can most likely replicate the "house sound" of any brand of audio gear and create a sound signature that can be applied via DSP effect such that swapping gear in an out of your system would seem pointless. Good way to kill an engaging hobby, I guess - but aren't we pretty much "there yet"?