Why monospaced fonts are not used as frequently as serif and sans-serif fonts, outside coding?

We see sans-serif and serif fonts everywhere, from the web to printed books and newspapers. I’m wondering why monospaced fonts are not popular outside coding context?

Here is a simple comparison I made using Pair & Compare:

We know that for monospaced fonts, letters and characters each occupy the same amount of horizontal space. Doesn’t this make monospaces fonts easier to read?

Not Preloading Self Hosted Fonts

I’m trying to preload fonts that are hosted on my site in the “fonts” folder. I received the following message in Google’s Lighthouse:

Consider using <link rel=preload> to prioritize fetching late-discovered resources sooner.

/fonts/bowlbyone-regular-webfont.woff2(www.name of site.com)
1,380 ms
/fonts/raleway-light-webfont.woff2(www.name of site.com)
1,380 ms

I added the following code directly above the </header> on each html page:

<link rel="preload" href="/fonts/bowlbyone-regular-webfont.woff2" as="font">
<link rel="preload" href="/fonts/raleway-light-webfont.woff2" as="font">

But, I’m still receiving the Lighthouse message to preload the .woff2 fonts. Any suggestions? Thanks!