Replacing the battery on my iphone takes 30 minutes and the only tools needed are a couple of screwdrivers and a new display adhesive. In exchange, the phone is a lot more waterproof. For me, it's a good tradeoff.
What's next? Mandating that the screens be "replaceable" as well? Having used a fairphone before, I can tell from experience that easily replaceable parts are more prone to breaking from dust and moisture etc.