Neocities.org
one of my biggest pet peeves with Neocities is how inconsistently HTML files pair to their CSS files. Multiple times during my coding, the HTML and CSS become unpaired and I have to change the name of the CSS to force a reconnection. This makes edits annoying because I need to change the name on EVERY HTML file. I worked around this by giving each HTML a dedicated CSS file (abhorrent, I know, but necessary.)
This has created a new problem when I edit something that I want to take effect site-wide, I now have to go through and implement the code into EVERY CSS file. So either way, I have to constantly edit every single page all because Neocities can't update the CSS and HTML. Ugh.