It’s hard to make water/dust resistant devices with the 3.5mm jack. It was designed to be simple not water resistant. Contacts are close, it’s an hole so water and dust hang out there. Some problems are shared by more modern ports (e.g., iPhone not charging because dust in the lightning jack) but to less extent. This is why they disappeared. Before it was a “must have” and producers had to either put more/better material or have a lower IP rations. After Apple showed that 90% of the people didn’t care, the others followed suits.