Why? Until bots are self-aware, bots are just another form of users using their own stake to vote how they wish, and we fully support that.
Okay, I'm in agreement with you there but the why is vandenberg saying:
The reason we are choosing to do both at the same time is to help human users a little bit against bots
Why propose something that is expressly intended to favor some users over others (and has the indirect, perhaps unintended, effect of favoring users who sign on for five minutes make a few votes and sign off over those who particulate a lot more)?
Another negative consequence of reducing the vote target is that voting will become a lot less casual and social because people will become more aware of their vote power being depleted. The most intuitive voting system is like that on facebook, reddit, etc. where you can make as many votes as you want without 'running out of juice' (equivalent to an infinite vote target). Obviously we can't do that but reducing the vote target is moving a lot in the opposite direction.
We want to strike a balance between forcing users to be aware of their voting power and making using the site effortless. We will likely target vote strength for the median number of daily votes made by users in a typical activity band. We also have some ideas for later in the year for making a user's current voting power more visually apparent to the user.