Re: Microphone adapter
Probably because "splash proof".
I dunno ... I had a Sony phone that was IP68 (or something like that) certified, and that had a 3.5mm jack and a micro-SD slot. It's not impossible to waterproof these things.
That phone was great until the non-replaceable battery died, the replacement battery I put in anyway also died, and the last version of Android for it became so ancient and insecure that I couldn't in all conscience continue to use it.
(It was the most expensive phone I've ever bought ... I think I paid about £320 including VAT)