It was very easy to take apart as it just used same size Philips screws.
Replacing cracked glass was hard as you had to soften glue and required a uv curing glue to attach the replacement, but would assume the fairphone treats the digitizer screen and front glass as a single replacement assembly also.
It's probably not as repairable as the the fairphone, but clearly it's possible to be waterproof with a removable back/battery and a jack.