Charlaquin
Goblin Queen (She/Her/Hers)
The primary definition of readability is “the quality of being legible or decipherable.”"Dry," "jargon," "technical," "dull," "like a video game" (that last one I take to be a criticism of the readability when the critic lacks the vocabulary to ger across their frustration wirh the formatting) are all terms I've seen to describe the readability 4E products on numerous occasions. WotC have continued to tout their use of natural language when making 5E, which is tied to the readability of the game.
Note the difference between "legible" or "organized" and "readable." Readabikity is about enjoyment and the aesthetic sense of interacting with a text, not the understanding of information.
Whether or not 4e was enjoyable to read is a matter of taste. It was most definitely more legible and decipherable than 5e is.