Why installing software for power users should be in a sideloading form?

Maybe the sideloader is a power user in comparison to the celebrities, but who is a real power user is those who can to sideload without the sideloading. Power users of your smartphone are: top-management of the vendor, the Government and 0-day scene. Sideloading actor IMO is just a poser to the idea of a power user.

Snoop-phone useds are powerless.