DAC break-in question

I'm in camp amp needs to be on to pass full signal through output section of dac.

As for burn in, I absolutely hear it, this over many decades and all sorts of equipment. But in any case, it all becomes a non issue once components have a certain amount of hours on them. Problem arises when one doesn't believe in burn in and dismisses/banishes newly purchased equipment, I've had personal experience in buying equipment from churners who didn't believe in burn in, I don't let on a thing, they assume equipment lousy, may be willing to let it go at a lower price.

I don't even bother dealing with burn in much anymore, have a desktop or bedroom system I can use for burn in purposes. Speaker, speaker mods and amp output tubes are the only instance in which I have to put up with burn in.

I do believe that break-in does happen. However,

1. I think the general sound characteristic of a component will be apparent when you first hear it. I do not believe that a new component will sound like a clock radio when first used then 500 hours later it sounds amazing

2. I think break-in smooths out some general rough edges of its sound

3. I believe our ears break-in as well. Our brains can distinguish the smallest of sound changes. I compare it to renting an unfamiliar car for a week on vacation. After a couple of days, you begin to feel normal with the differences compared to your regular car. 

4. Our ears change as well. Some days (very few)I can't listen to anything. My system sounds terrible. Most of the time, I love how my system sounds. 

I think break-in is a combination of many things.

I think that it's part of the game we play. When I built my amps, I was expecting 5-700 hours to burn them in. It's been a great journey, noticing when a significant step has been achieved, sharing the almost blossoming of the system with my wife as we take the time to listen for a couple of hours each night. (and getting very competitive in cards...)

My system has yet to hit it's peak, I bought the speakers first, decided I needed better power, so within a month of purchasing the speakers, I added two tube mono blocks and a tube pre-amp. Also threw in dual subs within a few weeks of hooking up the amps. Pretty much the whole thing is burning in before my ears and it's pretty cool. Oh, yea, I have a bluesound vault that has also been burning in, and if a loki max needs burn in...all pretty much the same age. 

My system does sound better each week, now, thinking of adding a phono stage and TT, also upgrading the bluesound, but will wait a while.

If your computer or microwave oven doesn't need a break-in period, then the same goes for your audio gear.
 

Tangentially, when I purchased a used Aesthetix Romulus that had been unplugged for a year, Aesthetix told me that a month on standby would bring it back to full performance...