I can admit, that the occasional use of Bold, Caps, Italics, or Underline can be helpful to express additional tone or emotion in a post. By occasional, I mean its special use, so that it stands out.
For example, when I used singular, and in italics, the aim is for the reader to voice that word in their head, longer than normal. To hesitate and contemplate on its usage.
However, whole lines in Caps or other styles, conveys either negative emotions, or nothing (typically). There is no rarity, so there is no additional meaning. And in this particular thread, if it is all sincere, then there is a language barrier involved.
And in that case, lines in all caps comes off like a English speaking homeowner saying the same thing louder and louder to their non-English speaking domestic worker, as if that does anything other than stress out both parties. Caps in particular is usually associated with volume or anger.
Its at best fruitless, and at worst derogatory and trite.