I've been using Scylla for a project and have ended up reading quite a few of those blog posts. They are generally very well written and useful, but I've noticed the same sort of issues. There's the chat popup at the bottom, a banner for Scylla Summit, a cookie banner that doesn't seem to remember what I clicked, and a header with broken transparency.

For me, Cloudflare is the benchmark. Cloudflare.com is very clearly a marketing site, likely run by their marketing team, but their technical content such as their blog and docs are on completely different subdomains with a clean design with no popups or banners. I think this is the best way to run tech focused blog, making both developers and marketing happy.