There is one metric where hand-coded-in-vim pages tend to do poorly, and that's cumulative layout shift. If you have images on your page (a reasonable assumption) and just stick <img> tags in there, you can get dinged on cumulative layout shift because the layout will shift as images get loaded.

I use a somewhat hand-coded-in-vim approach, but there's some post-processing that adds width/height attributes to <img> tags which mitigates this particular problem.

Edit: Not sure why everyone is telling me to add "height" and "width" attributes, because that's what I wrote in the comment, above. Just to explain how this works--the width and height attributes describe the "intrinsic size" of the image.