Multiple accounts are fine by me for a number of reasons.
It's the accounts that are mainly showing themselves eating food in a bikini on a deserted island in Indonesia that need to prove it is them with the 100,000 Instagram followers.
I don't need to prove who I am, my 'business' is not built around my 6 pack - because i don't pretend to have one.
There are easy ways to prove who you say you are. A picture of you, with your steemit login, and today's date (newspaper).
I am interested in the "number of reasons" as I said.
To me it creates an unlevel playing field (#votes /person/day )
and adds to the 'fictional' char problem.
Security
A 'community' account like @curie/@ocd/@steemitblog/cheetah/@spaminator/@minnowsupport /bidbots
steemvoter account to vote a subset of your total SP to people and communities you wish to support longer term
Testing
Zappl
To focus on individual subject areas
I think others could add to that list easily.
Thanks for info.