This is really terrible blanket advice, CF is one of AWS' worst products in my extensive experience with it (My team manages a ~$4 million monthly bill and locked into CF well before I joined). It has a number of significant limitations that aren't applied to terraform, it's pretty important to understand those tradeoffs if you're buying in.

Given that AWS supports terraform, it's really on them to provide a calculator for it as well. We're large enough that we just spent an obscene amount of money on employee time and effort to track our billing (lots of automated tagging), but until we did that it wasn't uncommon for a couple hundred thousand dollars of unnecessary charges to hit our bill every month.