As a founder myself I find it's more about the difficulty in finding a marketing strategy that has an effective ROI without increasing your burn rate to a point

As a founder myself I find it's more about the difficulty in finding a marketing strategy that has an effective ROI without increasing your burn rate to a point of failure. The article implies that all marketing will be effective, or at least that you can easily have a positive ROI just by hiring a marketer. This is not necessarily true, especially with the limited capital that many bootstrapped startup may have available. Experincing negative ROI (or even hearing experiences about that) seem more likely candidates for why it isn't done than the "Myths" listed here.