You can get away with it if there is some resistance in series with each one but yeah, the enemy here is that each of the regulators will have slightly differen

You can get away with it if there is some resistance in series with each one but yeah, the enemy here is that each of the regulators will have slightly different voltage and the unlucky one with highest will handle most of the current. Although I'd imagine you got lucky here because IIRC this particular's chip voltage drops with temperature a tiny bit so technically the one that starts to heat up would drop voltage, letting other pick up the slack