A few days ago, I tried to submit an answer and was surprised when a captcha popup appeared, requiring me to tick an "I'm not a robot" box and possibly pick out some pictures before continuing.
Why should we have to do captchas while logged in?
The system clearly recognised that I was logged in to my SE account. I've been around on this site for over a year and have got nearly all the rep-based privileges; why should I need to prove I'm not a robot at this stage?
(The result of this delay was that another user posted a near-identical answer first and got the accepted answer instead of me. However, this isn't the first time it's happened.)
If it makes a difference, my internet connection at the time was very slow and dodgy. I'd already tried to submit the answer a couple of times and just got an error message since the page wasn't loading. The captcha was also very slow to work. In the end I opened another window and posted the answer there, and succeeded without needing to complete a captcha test.