They
should be designed for us. The idea is supposed to be that there are limited times that developers are negotiating with the outside world about what exactly they are working on. The rest of the time, nobody gets to interrupt and demand that they drop everything and jump on to their latest crazy idea.
But yeah. I currently have to wear both the PO and dev hats, and, when I'm wearing the PO hat, I also see advantages: It means that I get to have a rhythmic schedule that I can set my calendar to. That makes all the orchestration crap so much easier.
Which, incidentally, I also like from a developer perspective. The less time I have to spend on that stuff, or get randomly interrupted by that stuff, or randomly interrupt people with that stuff, the more time I get to spend on actually building stuff.