One should be at the bottom one at the top. I understand space on the phone is a premium but a second port would make the phone so much more usable. Wired headphones, flash drives, camera modules, speaker modules, keyboards, even connection to a TV, all could be used while charging. It's a shame it's not a thing, USB is extremely versatile port, but you only get one and it's used for charging half of the time. (I am aware dongles exist)
Yeah gadget makers were able to water proof Walkmans back in the 80s and these were devices with probably a dozen real physical buttons, a headphone jack and battery compartment, and hinged wide open to let a cassette tape inside. Waterproofing as well as durable buttons was something that was solved decades ago regardless of what Apple's marketing bullshit has led people to believe.