‘Emojis’ are, in my view, are mostly used for non-constructive purposes, especially on social platforms pulling more casual crowds. There are descriptive Unicode characters such as the arrows → ← and check mark ✓ which more or less fill my own needs at the time, and they can conveniently be typed with the Compose key (
v/, albeit the latter outputs √).
I assume that editing or removing a system font package is required. Websites may supply their own fonts (can be disabled in Firefox settings, ‘allow pages to choose their own fonts […]’) or use emoji-like “reaction images” which can generally be trivially blocked with uBlock Origin.