Since the release date, many gamers complained about poise stat in game, some of them even thought that they forgot to turn it on. According to Bandai Namco, we were wrong all along and poise is working just fine, as they designed it.
But you have a point actually since the stat is working differently from previous games and is more situational. This can mean that AI has the advantage while you can't even stand on your feet.
"The poise stat is working as intended and is not ‘turned off’ as some fans have theorised,The stat works differently than in past games and is more situational, which seems to be the reason for the confusion."
I don't know what is more situational than being in a fight but there are no further explanations about this. So you just believe in yourself and stand strong. Take it hard way, take it like a man.