Proper multi-user support (which is something that the iPad still doesn't have at all today...) and a reliable operating system that doesn't crash multiple times a day are definitely customer-facing features.
A fast processor and a machine that doesn't heat up are customer facing too.
MacBook Pro can keep you from having children it gets so hot
You conflate a deliberate choice with ability. Apple obviously know how to make a multi-user system. They choose not to on the iPad. Totally fine if you ask me. If you want a full rich desktop experience use macOS.
The whole point of iOS is simplicity and ease of use. That is the feature.
And the ARM chips are?
Faster performance for twice the battery time seems to be.