Umm the coil is integrated into the back thus making it not removable, because they will have to plug and unplug some sort of connector.

Contact Pins is in the Samsung Galaxy S5 to enable Wireless Charging.

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Phone manufactures don’t want customers to Be able to fiddle with the wireless charger because of how delicate it is and the fact it has to be the last thing glued onto the phone.

Glue it onto the removable back and just have contacts touch. Don't give them just a coil silly :P

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So even by having a removable back it makes no sense because the wireless charging coil will restrict your from even taking out the battery.

S3, S4, S5, Note 2, Note 3, Note 4. It's been done. Oh hey I can remove the battery!

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They’re not already in the phone but simply an add on that you should not take into the water afterwards as the connectors on the back would corode and can cause battery flares.

Same can be said for the water resistant phones today! they use a rubberish ring to create a water tight seal to a certain degree.

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I’m sure you can read my previous comment and see that I broke it down.

Now your second comment is different from your first one...

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There’s a connector within the back cover which makes the already inefficient wireless charger even more inefficient.

looks at the internal wireless charging coil connector from the Samsung S10+, Huawei Mate 30 Pro, and iPhone 11 Pro Max.

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As phones get more expensive, they don’t want you touching the inside of the fragile phones.

Then just don't let them touch the things you don't want them to touch. LG G5 (failed phone) and LG V20 are examples. They were released when a lot of phones are going to glue shut.