How big of a speaker, though?

In the 80s and 90s the world moved to 6.5-or-less bookshelves which generally struggle with bass compared to a lot of modern smaller stuff. Meanwhile a lot of music started using low bass a lot more.

In addition to this, front baffle width correlates with efficiency, i.e. modern narrow front baffle speakers need a more powerful amp, combine that with the necessary smaller bass drivers and you see why most modern speakers have crap bass