Realist Model Attainment is a limited reduction in suffering. And limited positive externalities for others.
Aspirational Model Attainment is complete end of personal suffering, perfect virtue, omniscience used towards ending suffering for all sentient beings.
MCTB is one example, of a realistic model of enlightenment. People on DhO will generally have a good idea of the benefits of the realistic model. And I agree the realistic models are important and useful.
But we would be mistaken to dismiss the classical aspirational ideal of Buddhahood as useless myth.
Quite to the contrary, I have found the aspiration model has many important pragmatic uses, here are a few:
1) Empowering rather than limiting belief Rather than limiting oneself to a set attainment, that may well fall short of what it possible. The aspirational model encourages people to further their practice. And setting a high goal of what may be possible empowers people to achieve great things for everyone's benefit.
2) Focus on the process rather than attainment Basically by being pretty far out and seemingly impossible. It encourages focus on the ongoing learning, improving skill sets. And avoids falling into the trap of obsessing over arriving at some sort of imaginary destination.
3) Uncovers blind-spots To work towards the enlightenment of all sentient beings requires full engagement with the world. Doing this while holding a high standard for personal virtue and wisdom, will to bring to fore and shadows or blind spots that may otherwise be missed.
4) Avoids the trap of nihilism Nihilism can be a trap due to incomplete or flawed understanding of essencelessness. But it even in the face of such misunderstanding, the aspirational model of enlightenment side can conquer nihilism, by presenting a goal that has yet to be achieved and providing a sense of purpose and direction.
5) Cultivates humility and compassion In the face of such insurmountable goals. There is less likelyhood of falling into egotism at having attained something. And by focusing on benefiting others, deep selflessness is possible. There is a greater chance at attaining a genuine opening of the heart. In realistic terms this is the birth of compassionate concern for others that is not dependent on conditions.
With these points in mind I encourage you to reaffirm a completely unrealistic intent to attain enlightenment, perfect wisdom, perfect virtue, and accomplish other great things for the benefit of all sentient beings.