I'm a stander who's now reconciling; my H was a clinger whose MLC largely took the form of episodic rages and disappearances to climb mountains (and have EA's, and try to accidentally off himself), then returns to lurk moodily in the spare room. So I don't have the experience that so many do here, of a vanisher or of divorce sought or unsought.
But I can say unconditionally that the most powerful thing I've done in my life is to stand. I'm a risk taker, I try new things, before and after BD I learned to rock climb and skydive and mountain bike and dance aerial suspended 20 feet in the air... but the moment I most felt like I was flying without a parachute was when I learned to negotiate my peace with my raging H. To work on my agape, without expectation of any return. Once I figured it out (and it wasn't easy! thanks and hugs to the mods on this board who helped me, without ever making me feel stupid for failing), it was like I couldn't ever be hurt again, no matter what crazy H did. Zen master trick - and actually, isn't there a martial art in which you move only in defense? Aikido, I think? You land no blows, but use your opponent's weight and momentum against them, so any move they make will see them lying on the ground seeing stars.
Standing (and NC, to the extent that one can with a clinger) provided a shield for my emotions, and space for my wee fledgling self to grow unbruised and unbittered. Even if I'd in the end decided not to take back my H, think I might still identify as a Stander, because that's what gave me back my power. I wouldn't call it weakness. I wouldn't call it being a doormat. Standing is both a tactic, and a life skill. You may not need/use the tactic forever, but you do grow with the life skill. At least that's my own experience.
"You have a right to action, not to the fruit thereof; shoot your arrow, but do not look to see where it lands." -Bhagavad Gita