You cannot have a consumer device at a reasonable price point, designed to provide water resilience, which also contains an open section to the power supply.
You certainly can. Look up any flagship smartphone and you can see that they provide water resilience and they have a charging port.
By way of derogation from paragraph 1, the following products incorporating portable batteries may be designed in such a way as to make the battery removable and replaceable only by independent professionals:
(a) appliances specifically designed to operate primarily in an environment that is regularly subject to splashing water, water streams or water immersion, and that are intended to be washable or rinseable;
(b) professional medical imaging and radiotherapy devices, as defined in Article 2, point (1), of Regulation (EU) 2017/745, and in-vitro diagnostic medical devices, as defined in Article 2, point (2), of Regulation (EU) 2017/746.
Misleading title. Phones can still be glued. Waterproof phones still don’t need to have a user replaceable battery (the battery needs to be replaceable but by professionals).
You certainly can. Look up any flagship smartphone and you can see that they provide water resilience and they have a charging port.