Following your heart is a virtue. Writing about it bluntly, doubly so. Is one not free to leave a spouse for someone else? Regardless of age (assuming everyone is a consenting adult!)?

I give credit to those who live their life intentionally. You only get one. If you’re unhappy, pull the sails and head towards happiness. Valid point to not be a dick about it though (I haven’t read to know if these articles you mention are passive aggressive in tone). You can be direct but still kind.