User replaceable batteries doesn't mean "non waterproof". You can have little screws and rubber gaskets on the back cover. Or if you take your phone to do outdoor stuff in the UK you could just carry a pouch or ziploc bag for emergencies. It's not super convenient, but it's a price I'd be more than willing to pay if it means I can have a phone I can grab a new battery for for a couple bucks and keep it trucking. And it's convenient to have a spare battery while travelling. I guess a power bank will cover this, too, to be fair.
Yeh, I just use a power bank. You see for me I never really have an issue with battery life, I charge every night (wireless charging) and that is enough. Everyone will be different, I have never had a battery fail in a premium device (I have in the past with an old Nokia, but my bad, shouldnt have bought a cheap backup battery (which is another issue with user replaceable and the cheap knock off batteries on Amazon/Ebay etc., an exploding battery in a phone is not a good thing)) so for me personally I'd rather have future phone design go all out, be innovative and not be restricted by having to have a removable battery (for example what if a clamshell with a flexible screen had a flexible battery that covered the entirety of the phone... off the top of my head, but foldables will definitely be affected)
This legislation isnt about the ability to buy multiple batteries so you can keep going for longer or if damaged (yes thats a nice to have), that would actually go against why this legislation is being brought in in the first place. This legislation is to do with waste, which is nice, I'm all for saving the environment, but here is the issue for me....
I change my phone every two years, I dont do it for battery replacement reasons
If I had the ability to swap batteries then I'd probably would go out and buy multiple batteries
2 years comes around and I swap phones
Instead of 1 phone and 1 battery to dispose of there is now a phone and multiple batteries because you can be darn certain the next phone I upgrade to wont use the same batteries
Now I get it, that isnt the same for everyone, and a lot of people keep phones for years and so they may get to the point they are changing their phone for legitimate battery reasons, but I personally dont know many people who do that, they all change their phones when their phone contract is up regardless if they need one or not in most cases, we are so used to having a 2 year phone contract that when it expires we get a new phone (in the UK)
The simple solution is to give people a choice, but that would be up to the manufacturers to make premium devices with both replaceable batteries and none replaceable batteries which is great for the consumer, but no good for the EU legislation.