> They covertly slow down your phone yo mask that it is defective and needs a new battery.

So Apple should have juts let iPhones with old batteries become unusable?

> Or design a phone with removable battery or at least a decent battery.

Increasing battery size means increasing phone size - and Apple wants the iPhone to be sleek. Removable batteries also have certain design implications that increase the bulk of the device. Apple's products are at the top end of the market, where form factor is more important than serviceability. Mercedes' are more laborious to service than Toyotas. iPhones are more laborious to service than cheaper devices.

It is a faulty device, they should be honest about that.

A better battery would also lead to a phone that lasts longer. And that's bad if you are apple.

A "better battery" would have been a larger battery, which makes the phone bulkier. This isn't a good or bad choice, it's a tradeoff between form factor and battery life. This is a good choice for customers that want bulkier phones with longer battery life. But it would be a bad choice for customers that want a slim phone.

The software fix also leads to a phone that lasts longer.

Bad for Apple? No.

If you consider the phone usable, sure... But the number one reason to buy a new phone over an old one is because it is slow.

Sure but that’s an effect of new phones being a lot faster because of advances.

That is a very charitable viewpoint in the context where apple are accused of slowing down devices.