Writers should never use the words "arguably," "ubiquitous," or "plethora."
Anything worth writing about is arguable. Therefore, arguably, the word adds nothing to a description.
"Ubiquitous" is a big word. There is another word that is just as good but not as pretentious. Nevertheless, the word "ubiquitous" is everywhere. It is also widespread.
Like "ubiquitous," "plethora" is a good word for the SAT, but little else. There is an excess, profusion and abundance of those who use "plethora" too much.