The Samsung Galaxy S5 mini has a IP67 rating and a removable battery.

It’s possible to produce water resistant phones with removable Batterien, but manufacturers would rather sell new phones instead of batteries.

https://m.gsmarena.com/samsung_galaxy_s5_mini-6252.php

Yes. 1TB SSDs can be bought new for 50€, 500GB for even less. For some people this is expensive depending in the region (e.g. I also know someone who uses an HDD). But given the price of other pc parts it isn’t something to cheap out on (a 1TB/2TB HDD is also 50€).

The survey was originally sent out on reddit /r/selfhosted, so I expect most respondents are from there.

Agreed. Being able to customize all elements of the top bar is one of the great things about Firefox.
I don’t see a reason why it shouldn’t be possible to remove newly added elements. Even the “Open a new tab” button can be removed, as well as the recently added “View recent browsing across windows and devices” button.