The content is already amazing, but the delivery is poor.

Both assertions are subjective. I happen to agree with the former and disagree with the latter. This site is one of the very few content-driven sites I use which is fast, reliable and bandwidth-lean. I wish more were like it.

Mobile delivery is not subjective...
There are numerous standards which set out design standards for the mobile web such as W3C and Google. Google Search Console evaluates websites for mobile compatibility and, for my personal site it gives warnings such as Text too small to read and Clickable elements too close together. My website suffers the same problem as here - it was written in the days when websites were viewed on desktops. That world has changed.

This site is one of the very few content-driven sites I use which is fast, reliable and bandwidth-lean

These days most sites that are lot laden with AJAX (yes - I'm looking at you Facebook) are fast and I agree that this is important. But, all the site speed in the world is lost if the user has to pinch the screen to expand it to avoid pressing the link right next to the one they mean to press, then turn their device on its side to get a wide enough view to read the text.

Reliable I totally agree with and, given that this site is written by Perl experts, the software reliability should not be an issue and the hardware is constant.

I don't know where on the planet you located hippo - maybe it's different at the bottom of a riverbed - but here in the UK we live in a world of mobile video streaming and bandwidth costs half of nothing both to serve and to consume. Bandwidth is a concern but not at the expense of usability.

But I go back to my point that this site sends the wrong image...just for one moment compare what it looks like to Mojolicious. That site is bright, funky, east to read, responsive and mobile-friendly. It's look and feel is a credit to the product and to Perl. It sends the message of modern technology that is fit for today's world.

Surprising, because your second post here ( Re^2: Development of PerlMonks "Mobile" is now open for business ) was in a reply to a post which mentions it explicitly.

Personally, the "old school" look of the site is what I initially found so appealing. The great help I've received so far has just been icing on the cake. However, I do know that people in the wild are sometimes turned off by the site's presentation, which is a shame given the great content here. I just came across this recently in a Mastodon conversation I was having with someone espousing the friendly Perl community and this site in particular. So maybe giving the site a slight face lift to attract new people may be a good idea.