Of cours it does. Its a standard thing on a computer platform. This is why I think its completely blown out of proportion.
What does this have to do with planned obsolesce? Why do people start throwing these words around every time they don't like something? Batteries are subject to wear and tear. There is nothing "planned" about it — its just how it is. When a battery is old, it has to be replaced. This is as valid for a contemporary mobile phone as it was for a walkman in the 70ties. Its your choice if you want to buy a new battery or a new phone. And why 12 months? Are you suggesting that the battery needs replacement after a year? I am very sure it will last longer than that. Never noticed any slowdowns on any of my iPhones, which I usually own for around 2 years.
Maybe Apple should just introduce a switch in preferences and let people who don't want safety features just deal with crashes and data loss if that is what they want.
P.S. My 6S had a battery recall so the battery got replaces for free. I am very sure that this has also been forgotten now and the phones with factory defective batteries are also being thrown into the pot. Maybe thats how the "12 months" thing is born.
You didn't ask me personally but I'd like to address the bolded bits of your post if you don't mind.
Batteries are subject to wear and tear ...agreed
There is nothing planned about it...agree all battteries wear out
When a battery is old, it has to be replaced....agreed
Its your choice if you want to buy a new battery or a new phone...
This is where it gets sticky. Apple feels it's necessary to throttle your battery because it can no longer function properly. The customer then has the battery tested by Apple and they tell you the battery is still good, and then refuse to replace your battery even if you pay full price.
Can you see how that is confusing to the customer? The customer trust Apple so figures their phone is just messed up. Some of these customers will just buy a new phone. They have no way of knowing a new battery will fix the issues they are having. No one is disputing that batteries go bad although I too think one year is rather short lived. If Apple feels it's necessary to throttle after that period of time then something can't be right.
Anyway, have a good day and thanks for the discussion.