It's a pretty smart move as a whole to avoid imprinting actually
Let's consider factors where in their imprinted guides die, their partnered Espers would suffer their whole life too as the could no longer be guided by any other guide other than their imprinted one
And another, in cases of expeditions, they might not be together always hence why in times of rampaging at least there would be a guide to guide the esper for a while
It's a smart and cautious move that ensures both of their safety, and most of all, they already love each other just as much, they can bound themselves with each other without putting themselves at risk
It's a pretty smart move as a whole to avoid imprinting actually
Let's consider factors where in their imprinted guides die, their partnered Espers would suffer their whole life too as the could no longer be guided by any other guide other than their imprinted one
And another, in cases of expeditions, they might not be together always hence why in times of rampaging at least there would be a guide to guide the esper for a while
It's a smart and cautious move that ensures both of their safety, and most of all, they already love each other just as much, they can bound themselves with each other without putting themselves at risk