Exactly. If you're working on a project in Ardour and want to quickly watch a video on YouTube, stopping Jack and starting PulseAudio was a bit of a pain the last time I did that.
Yes, you can configure PulseAudio as a Jack client, but the session handling is also a bit messy. (I used to have a PA -> Jack setup on my work computer just so I could use the Calf equalizer / compressor plugins for listening to music. I dropped it again after a while, because session handling and restoring wasn't always working properly. But that was around 6-7 years ago, maybe it would work better nowadays.)
Yes, you can configure PulseAudio as a Jack client, but the session handling is also a bit messy. (I used to have a PA -> Jack setup on my work computer just so I could use the Calf equalizer / compressor plugins for listening to music. I dropped it again after a while, because session handling and restoring wasn't always working properly. But that was around 6-7 years ago, maybe it would work better nowadays.)