It's kinda like saying that most of the legwork in space exploration goes into space ships and mission logistics so just building a dumb launcher rocket is far

It's kinda like saying that most of the legwork in space exploration goes into space ships and mission logistics so just building a dumb launcher rocket is far more tractable problem. Indeed, building Saturn V is nothing compared to flying men to the Moon and back. Does not mean you can build a Saturn V from scratch. And people who are promising to teach you how either are geniuses or just in denial.