DeletedUser495 Also it is in no way security related.
A removable battery is security related because if is not trivial to replace it yourself (which is the case with Pixels), you would have to use someone else's service, i.e. grant physical access to the device.
23Sha-ger true water resistance
Most people rarely dive with their phone but everyone needs to replace the battery at certain time, so the usability benefits of a removable battery are probably greater than those of a water sealed device.