TTFB is pointless if you throw a cookie notice, a newsletter prompt and a bunch of ads in your users' face. It's not much better if you hide the answers your users come for in a sea of SEO keyword spam. You just annoy your users really efficiently.

I'd rather wait 5 seconds for a straight answer than deal with a really fast, but really annoying website.

What site achieves 10ms? Even HN is 70ms for me when I disable caching. And that's ignoring the HTTPS handshake.