With my AirPods Pro 2 my iPhone says about 68dB, so I don't think I'm too prone to listening at ear splitting levels. I used the SE846 setting on the TW1 as far as I remember, configuring the TW2 the same as soon as I received them... and was treated to a rather lifeless experience, with which I lived for some time, with growing frustration. Then I changed the setting to SE215, and my SE846 was back to the full sound I was used to. So this was not about the available max volume, but the expected output at my preferred setting. And no, I don't crank the volume up to 11
I worked many years as a live sound engineer on the side, so I'm quite aware of issues with too high SPL. Always used custom hearing protection from Neuroth on location or when DJing. One reason I like the SE846 is its high level of passive isolation btw., which lets me enjoy music in loud environments without increasing volume.