An Apple ID is limited to a single person. The HP requires the use of the Apple ID, thus only one person can control it. The 'competition' has no such barriers. At least one can be 'trained' to recognize the voice of multiple people. I assume the HP can be controlled by any number of voices, the program choices are limited to those of the Apple ID owner.
I'm also tired of calling it an "Apple ID", it's nothing more than a password.
Only Apple comes up with names that force people to use the brand name... and it adds more confusion to the log in process, IMHO. YMMV. It's just a(nother) one of my collection of "pets". At least those "pets" don't need food and water!