That's a common theme today, but language certainly does have rules, and writers, when applying those rules, are driven by the need for simple, clean expression. Language certainly does evolve, however, because it is a living entity. Our English language is intrinsic, but usage reflects the common idioms, and newly-coined words and phrases, adopted as the years progress.
One of my more challenging uni lit exams contained a section where I was required to write an entire page describing a person (imaginary or known) without the use of an adjective. Adjectives are frowned upon for destroying clean, clear writing. Verbs are preferred. The other no-no: exclamation marks, because they dictate thought, rather than letting the reader interpret the piece. I still find myself, though instinctively knowing not to use them, adding them after words, particularly on WhatsApp chats, etc.