"it'll be phenomenal, half-finished and then abandoned as engineers/leaders get bored and work on the next big thing" You have just described every project at

"it'll be phenomenal, half-finished and then abandoned as engineers/leaders get bored and work on the next big thing" You have just described every project at every large software company. However, important to note that usually "phenomenal" is an idea driven by all the non-engineer stakeholders.