As far as I can see, the ONLY reason to use the word “plethora,” as opposed to “many” or “a lot,” is to let the world know you are a big pompous jackass.
We get it, you are so smart that you need to let us idiots all know by using a big word when a littler word would do!
Nice job Jackass!
There are actually dozens of impressive sounding words similar to “plethora” these jackasses are apt to use.
Not to be obstreperous, but I will save them for future.