Pagination was the solution to the frustrations of infinite scroll, around 2,000 years ago. "Scrolls" were obnoxious to handle, and a nightmare to cite or reference. Rich owners of libraries built special racks so they could just leave scrolls open to their last reading-spot. Some unrolled the whole thing - permanently - and climbed up & down ladders to read.

If you seriously have a lot of stuff to display, then seriously you need pagination.

The invention of the paginated Codex (ie, paged book) enabled citation & reference as we know it, and led directly to an explosion of research & information-dissemination ... heretofore 'locked away' in scrolls. WordPress calls its tech-library, "Codex", in cogent homage to the value of structuring facts & knowledge ... and repeatable, predictable access to it.

Infinite scroll can be fun in certain ways & situations for users, and of course developers never met a novelty they didn't become infatuated with. Generally though, using pages is the imperfect solution that delivers the most, at the least cost. Think Democracy, and human rights: less than ideal, high-maintenance, and often abused ... but as good as it gets, and where would we be without it?

With infinite scroll, think "frames" and "fixed content blocks". Handy tech in specific contexts - but deprecated by over-enthusiastic or outright inappropriate deployment.