Why would decentralized technology be easy to use?

Limewire was installed on over one-third of computers world wide in 2007 [1]. That's because even grandma could press next->next->next on a window setup file and it just worked. There is no technical reason hosting your email isn't as easy as that.

Look at roof top solar panel. Literally hundreds of millions of households have roof top solar to generate decentralized power. The fundamental complexity in email hosting is hundred times less, but the software engineering community choose to not make it possible.

[1] https://en.wikipedia.org/wiki/LimeWire