Are you thinking, perhaps, of Mark Twain? I've never heard anyone say he was "painful to read" or "oozes pretentiousness"; you could be the first. Yet it was Twain who wrote, "the difference between the almost right word and the right word is really a large matter—’tis the difference between the lightning-bug and the lightning," which is what this "draft #4" business is all about. (He stole the phrasing from a friend of his, but the sentiment was his own, in a letter in 01888 to George Bainton: https://quoteinvestigator.com/2019/09/02/lightning/)
> In promulgating your esoteric cogitations, or articulating your superficial sentimentalities and amicable, philosophical or psychological observations, beware of platitudinous ponderosity. Let your conversational communications possess a clarified conciseness, a compact comprehensibleness, coalescent consistency, and a concatenated cogency... Sedulously avoid all polysyllabic profundity, pompous prolixity, psittaceous vacuity, ventriloquial verbosity and vaniloquent vapidity.
McPhee's essay Somers was commenting on warns against the same danger:
> In the search for words, thesauruses are useful things, but they don't talk about the words they list. They are also dangerous. They can lead you to choose a polysyllabic and fuzzy word when a simple and clear one is better. The value of a thesaurus is not to make a writer seem to have a vast vocabulary of recondite words.
So clearly McPhee was not advocating the unnecessary use of hundred-dollar words [correcting for inflation since Twain's time].