I guess it's really a skill to finish what you started, that most don't acquire for themselves.

Not only at learning something. The rate of people who quit a job or a relationship within the first few weeks has quadrupled in the past few decades.

People unlearned what commitment means.

Whenever problems or inconvenient things occur, it's normal and I think one should always view it long-term, plus give it at least 6 months until they decide to stop something if it's not for them.