This way of establishing an empathetic and compassionate relationship with your future self makes it easier to have self-discipline. It takes most of the pain out of persuading ourselves to do what’s for our long term benefit. Having empathy for our future selves stops self-discipline being self-punishment and turns it into self-care.
There’s less likely to be a backlash because you’re not forcing yourself to do anything; instead you’re persuading yourself in a rational and kind way. Thinking about the pleasant feelings you future self will have as a result of your present actions brings a sense of joy into the present moment. Having gratitude in the future for your past self’s actions is also a source of happiness. All this is much more pleasant than trying to “power through.” And a self-compassionate approach helps you to feel better about yourself, because you see yourself not as an enemy or as an obstacle to your own happiness but as a friend and as someone who helps yourself to live happily.