Is headphone listening a primary or backup for you when listening to music?

I use headphones if I am on my personal desktop working on personal stuff and if I want to sample music before purchasing or adding to the Spotify library. I also extensively use headphones/earbuds while I go on long walks.

High end headphones 90% of the time. And I actually have treated room and room correction. Still does not sound as good as in planar cans.

I have a dedicated desktop headphone HiFi system, but I do keep a high quality headphone system integrated into my main speaker system that I use purely for diagnostic purposes and providing a different perspective of reference when making changes at or near the source. This can be very useful.