Totally get your point. I've thought of it like this.. at least this is MenO 2018 (disclaimer subject to change with no warning)

The issue with one following our passion is that we attach that notion to the idea of being successful at it. But, because the definition of success is redefine by our economic needs, then our expectations are set to the standard.

No Money = you suck
Money = you are good

Of course we know that logically this can't be true. As there are plenty of mega talented individuals who've never made much money doing their art, following their passion.

The truth is that financial gain is probably more connected to other fields of knowledge than the ones most who would follow this advice would feel identified with.

For example:

Someone who is a good musician (not great, just good), but is a great leader, a businessman, a networking ninja. Has a huge advantage over one that is ten times better a musician but has no idea how money and business works.

However, to me the idea of following one's passion is still valid. But, we must define what it means for us to be successful at our passion. If we are not willing to think about that, to unattach money to our sense of self worth. Then I would say - Don't do it.