Do you trust your system?

I was constantly upgrading gear, demoing songs, reading reviews, trying to find out why I had the feeling that the song I was playing shouldn’t sound the way it does. Something off or lacking, I luckily found a set of equipment and a room setup that if a song is off, it’s likely recorded that way. I trust my system to do a decent job.  I wonder do others get to a point where they are more critical of mastering techniques than something wrong with their equipment? Admittedly, it’s easier to say how a piece of gear or cable made some significant difference, but in what exactly since the music sources are so wildly manipulated by engineers?