
"Blending the spirit of Eats, Shoots & Leaves with the science of The Language Instinct, an original inquiry into the development of that most essential-and mysterious-of human creations: Language"
> I do here … complain to your Lordship … that our Language is extremely imperfect; that its daily Improvements are by no means in proportion to its daily Corruptions; and the Pretenders to polish and refine it, have chiefly multiplied Abuses and Absurdities … Gentlemen … introduced that barbarous Custom of abbreviating Words, … as to form such harsh unharmonious Sounds … They have joined the most obdurate Consonants without one intervening Vowel, only to shorten a Syllable: And their Taste in time became so depraved, that what was a first a Poetical Licence, not to be justified, they made their Choice, alledging, that the Words pronounced at length, sounded faint and languid … Instances of this Abuse are innumerable: What does Your Lordship think of the Words, Drudg'd, Disturb'd, Rebuk't, Fledg'd, and a thousand others, every where to be met in Prose as well as Verse? Where, by leaving out a Vowel to save a Syllable, we form so jarring a Sound, and so difficult to utter, that I have often wondred how it could ever obtain.
— A Proposal for Correcting, Improving and Ascertaining the English Tongue [taken from https://www.jacklynch.net/Texts/proposal.html]
Or in other words: “It’s ‘dess-turb-uhd’, with THREE vowels! Not that nasty word ‘dess-turbd’ which is impossible to pronounce! What a horrible degradation of the language!”
(For more of this, Deutscher’s The Unfolding of Language contains a highly amusing list of examples dating all the way back to Cicero in 46 BC, who complains that the speech of his day was sadly degraded from the great orators of the past. I’m certain I’ve even seen an Ancient Egyptian complaint along these lines, though sadly I can’t seem to find it now.)
Besides, even when you just look at morphology alone, ancient languages are no more complex on the whole than modern ones. Thus consider Russian, which has more cases than Latin (IIRC). Or Hindustani, which uses an entirely different case system depending on the aspect of the verb. Or Swahili, where the verb inflects for both direct subject and object (but not always!), which have no less than 18 irregular genders, as well as for 28 tense/aspect/mood forms (if Wikipedia is to be trusted) — amongst other categories.
What happens, it turns out, is that languages can grow more complex over time as well as simpler. People do tend naturally to simplify, delete and abbreviate syllables in words — but they also tend to merge words together and elaborate simple constructions to more complex ones, in order to retain the expressive capabilities of their language. I’ve already mentioned Deutscher’s bool The Unfolding of Language; I will recommend it again here, since it has a great summary of exactly how these processes work and interact with each other in order to generate complexity in language.
So let's look at the two parts you quotes from me and give some examples. We've conversing quite well, wouldn't you say? You understand me and I understand you? So #1 must be true, right? But have you ever played the game telephone[0]. With the general outcome of every game that must mean that #1 cannot be true, yet here we are. Like I said before, when communicating there's: what is intended, what is said, and what is heard. Usually these align pretty well. But small fuzzing adds up quite quickly. But it should also illustrate to you that what you hear (or read) isn't what the speaker (or writer) intended. Their job is to convey as best as they can to you while your job is to interpret as best as you can. Language being of this form allows us to express wildly abstract concepts, especially ones beyond our capacity to even understand. This is the usefulness of natural languages. But it is also why we created mathematical and programming languages, but why they will never be able to have the same expressiveness. You cannot program what you do not understand. But you must be able to talk about what you do not understand, if you are ever to hope to one day understand it.
I'd encourage you to read both more about linguistics and compilers. If you're feeling lazy, Tom Scott has some decent linguistics videos and are aimed at STEM audiences. For more technical maybe see NativLang. For a book, checkout The Unfolding of Language.
[0] https://en.wikipedia.org/wiki/Telephone_(game)
Edit: btw, you did get the meaning of finger shoes (German) even with the extreme limitations of only text based communication.