In article ,
RichA wrote:

Why is it these Millenial-friendly hightech companies all think they know
better than the consumer?

because the various companies have extensive repair, crash and
performance data that users do not.

Why not advise people that this is the case and
let them CHOOSE to reduce the speed of the device?

because if users choose wrong (which they invariably will), the device
may crash, be permanently damaged or possibly worse.

new android malware cranks the cpu so hard that the phone
self-destructs:
http://www.androidpolice.com/2017/12...ning-malware-l
oapi-capable-physically-damaging-phones/
The cryptocurrency mining module maintains a load sufficiently high
enough to cause physical damage to a test device after two days‹the
above photo shows a device which overheated to the point the battery
bulged.

many computers throttle cpu speed when it gets too hot. otherwise, it
will stop working entirely. users don't like when that happens.

some nikon flashes shut down when they get too warm. users don't like
when that happens either, and many consider nikon's threshold to be too
low.

And what is so dire about
getting a battery changed?

nothing. nobody is preventing anyone from doing exactly that.