That's stupid or disingenuous bullshit. Emoji makes an expressed thought harder to understand, while the HTML presentation coupled with a web browser makes it easier. It's exactly the opposite.
Smileys make it easier for the people who use them to express their thoughts. That is why they use it. And you know that too, at least based on your comment: "Instead of expecting people to exercise their language skills, we're just enabling stupid people to be more stupid. Their last motivation to learn to speak properly was to communicate with other idiots like themselves, and emoji shits on that."
So it's you who's disingenius here. Or, to put it bluntly, a complete hypocrite. Especially since your own grip on the English language appears to be tenuous at best, as demonstrated below.
I don't expect if I get a polite response, and since you appear to understand English,
Pity you can't write it
Such as when displaying a short message, for example. They are typically displayed in system font sizes, which are usually non-trivial to change for the average user.
So now average user's convenience matters. Of course, they seem to be just fine with smileys since they keep using them... So perhaps it's you who finds changing font size non-trivial?
Why is everything HTML to you? Is that the only technology you "understand"?
HTML is cross-platform, allows embedding images, and is often used to render messages, so your "small-smiley" scenario could theoretically happen with it. Was that really too hard to figure out?
Never mind, rhetorical question. I see little reason to continue this, since it's obvious you have nothing besides playing(?) dumb to add. So long, and the next time you have trouble with technology simply ask for help, rather than coming up with a ridiculous tale about trying to protect "idiots" from too much convenience.