If you want to start me, you've a long way to run.
FA, a long, long way to run
If you want to end me, you'll need an apparent pun.
Seek my middle, and you'll find a tech holy grail,
AI (Artificial Intelligence) is a tech holy grail
Though its inherent dangers would make many go pale.
Failure has inherent dangers for sure
Come to me! You'll find science, or maybe a tourney.
Science is all about failure leading to success, tourneys have multiple losers and only one winner.
I'm a trait of a trait of your very first journey.
Your first journey was crawling? A trait of this was instability/falling? And a trait of that is failure.
I'm a part of the best games, as most recommend.
Most games hinge on initial failures and subsequent improvements.
But for many a couple, I'm the end of the end.
A failure to communicate, maybe?