<aside> is from the era from about a decade ago when semantic HTML was all the rage along with <article>, <main>, <footer>, <header>, <figure>, etc... Nowadays

<aside> is from the era from about a decade ago when semantic HTML was all the rage along with <article>, <main>, <footer>, <header>, <figure>, etc... Nowadays I've noticed the focus has greatly shifted onto parts of HTML that are relevant to web application development.