What is the most overlooked consideration?

SYSTEM synergy

It may be hard to define in words, but you know when you have it (or lack it.)
A newly selected audio component inserted into your rig can create an audio performance change now ranging from poor/non/optimal to good/ ​​​​​improved.

Think all the daily AGON forum posts asking for new components recommendations.The conflicting responses range widely and all too many simply reflect personal fave bias.

Just because a touted Brand X component seemingly works well in a Respondent system, is no assurance that it will succeed in OP’s system.. “ One size does NOT fit all”…

All the things previously mentioned are considerations, I also need to see quality parts, I also much prefer point to point wiring in pre's, amps, speaker crossovers, power supplies extremely important.

A mis-match of the preamp and the amp that can hinder the overall performance.

@2psyop 

My top criteria’s when choosing a gear; does it provide long-term musical connection. More importantly, does it invite me to play more music, not just “audiophile tracks”?  Secondly, synergy and lastly designer’s (manufacturer) integrity and accessibility; if and when I need the support of the person or team behind the product. 

I have gone through my fair share of components in my pursuit of putting together an audio system that connects you to music intimately. A good audio gear doesn’t just sound good, it changes your behavior; how you feel and appreciate the music. 

Reputation matters but resale, it’s a crap shoot :-) 

For myself, build quality / proven reliability is of the utmost importance. Then after requirement is met ( hopefully), sound quality that brings you closest to live music. 
 

I can’t be bothered by finicky, questionably made products & shipping back expensive & heavy stuff for repairs or modifications. That type of annoyance & frustration would take all of the enjoyment I get out of listen to good music. 
 

For example, I bought a really good turntable/ arm /cartridge over 20 years ago & it still works perfectly & sounds excellent. One new belt & one new cartridge ( mishap w/ a cat). I think in general, smaller American companies have the best chance of providing such consistent quality.