The side effects of ambitious goals are often the most valuable thing achieved

A quote by Ciro's Teacher R.:

If the goals are not ambitious enough, you risk not even having useful side effects so show in the end!

By doing the prerequisites of the impossible goal you desire, maybe the next generation will be able to achieve it.

This is basically why Ciro Santilli has contributed to Stack Overflow, which has happened while was doing his overly ambitious projects and notice that all kinds of basic pre-requisites were not well explained anywhere.

This is especially effective when you use backward design, because then you will go "down the dependency graph of prerequisites" and smoothen out any particularly inefficient points that you come across.

Going into such productive procrastination is also known informally as yak shaving.

There are of course countless examples of such events:

The danger of this approach is of course spending too much time on stuff that will not be done enough times to be worth it, as highlighted by several xkcds: