It depends on the size of the line and the cleats or bitts but it's certainly true that if a locking hitch can be applied without jamming, then it's likely that the OXXO will hold fine as well. At least if the line is over 1/2" to a cleat sized to the line. If you've got a wee line on a big cleat, then you might pile up the XXXXXXXXXXX's, tempted by that evil saying, "If you can't tie a knot, tie a lot." To keep the pile on the cleat small, I moor with OX&lock to the deck cleats which has never jammed. Even in winter I sail a lot but still we've had times where I went 60 days without moving the boat, plenty of time for a jam if it were going to happen.
I saw at the town dock yesterday a boat moored with at least eight locking X's per line.
In general, cleats are pretty fool-proof so long as the cleat knot is formed by swinging towards the bitter end. One sees the occasional backwards knot where the lock leads out to the standing part. Alaxander the Great had the only remedy for that.
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