That's not the case at all. In fact, advertising on facebook (at scale) requires very complex measurement with statistical models.
People need to understand that marketing (in this case advertising) is hard. Just because you can code or do something else and you are a generally smart doesn't mean you can figure out how to buy advertising after 20 hours and reading some blog posts straight from google's search results.
Dear god this. For most advertisers with a decent budget, measuring ROAS for FB on a last click basis across channels will lead to disappointment.
Unfortunately, developing a proper attribution model with post impression conversions (not just click based) is arguably the hardest challenge in the industry today. There is no one size fits all approach and even as someone who does this for a living and is well versed in the matter, I still haven't found a great approach. Incremental list testing isn't always easily done.
People need to understand that marketing (in this case advertising) is hard. Just because you can code or do something else and you are a generally smart doesn't mean you can figure out how to buy advertising after 20 hours and reading some blog posts straight from google's search results.