Disciplining ourselves to use plain English makes us better communicators. All professions develop their own terminology, but it's valid only when it genuinely provides a useful form of shorthand among insiders. But even where these words are legitimate, they are easily devalued through overuse. In particular, we should never use jargon and buzzwords to communicate with the outside world, because these words are not a universal language. Using plain language is a question of practical thought, not abstract grammatical rules.
Clear language is evidence of clear thinking.
When writing fails to convey a clear message, it is often because there is no clear thought behind it. They add nothing, so try giving them up. For some strange reason, activities associated with keeping a diary have spawned a whole sub-genre of phrases involving 'windows' and 'white space'. In fact, most British people who use baseball expressions don't understand what they are saying themselves. Euphemisms enable people to escape from emotion and detach themselves from the moral content of what they do.