Sturdy, somewhat shock-proof and waterproof
As serviceable / repairable as possible
Yea those two are a bit tough to find together on a phone. I mean you have fairphones which are very repairable, but it's only splash resistant, not submerge resistant.
But I found this phone called Nokia XR21 which is $499 and is has IP rating of IP68/IP69K and it's build as a rugged phone which is very resistant to drops. 6.49 inch display and has a 3.5mm headphone jack! No removable battery tho. It has 3 years of OS updates and 4 years of monthly security updates. Personally this phone looks great to me, but this is a midrange and they don't make flagships so I went with a Samsung Galaxy S23.